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Osaki OS-4000CS Facts: 173 Specifications & 18 Highlights

Still on the fence? Take a deeper look into the Osaki OS-4000CS specs — all 173 of them, including fan favorites like general information, dimensions & weight, design & materials & massage mechanism.

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Osaki OS-4000CS

Highlights ¹⁸

No extras. Just what matters.

                                
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                                        Osaki OS-4000CS

Why is Osaki OS-4000CS better than other massage chairs ?

General Information Dimensions & Weight Adjustability & Positions Vibration Features Safety & Protection Power & Performance Maintenance & Durability Package & Installation

General Information

8.51 lbs higher weight capacity The maximum user weight supported by the chair structure. 300.0 lbs vs 291.5 lbs

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Dimensions & Weight

0.26 inch wider design The total side-to-side measurement of the chair in an upright position. 30.7 inch vs 30.4 inch
7.39 inch deeper seat The front-to-back measurement when the chair is in a standard position. 63.4 inch vs 56.0 inch
2.03 inch taller frame The full height from base to top when upright. 47.2 inch vs 45.2 inch
0.25 inch broader seat The width of the seat area where the user sits. 21.0 inch vs 20.8 inch

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Adjustability & Positions

Adjustable Height Allows height alignment for different user sizes. with a difference of 54.0 points
Adjustable Shoulder Width Lets users modify the roller track width for shoulder fit. with a difference of 65.0 points
Adjustable Neck Position Adjusts neck support height or angle for better relaxation. with a difference of 63.0 points
Adjustable Lumbar Zone Enables fine-tuning of lumbar pressure or depth. with a difference of 66.0 points

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Vibration Features

Features Independent Vibration Control Allows vibration to be used or adjusted separately from other functions. with a difference of 64.0 points

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Safety & Protection

3.61 min shorter timer duration Duration before the chair powers off automatically for safety. 15.0 min vs 18.6 min
Features Emergency Stop Button Instantly stops all massage functions when pressed. with a difference of 66.0 points

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Power & Performance

16.74 Watt stronger motor power Power rating of each motor or the total motor output. 150.0 Watt vs 133.3 Watt
2 dB quieter operation The sound level produced during normal operation. 50.0 dB vs 52.0 dB

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Maintenance & Durability

Provides Self-Diagnosis System Detects internal issues and displays error codes automatically. with a difference of 63.0 points
0.89 month longer maintenance interval Recommended time between routine maintenance checks. 12.0 month vs 11.1 month

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Package & Installation

9.38 inch smaller package depth The total depth of the chair package. 62.0 inch vs 52.6 inch
6.2 inch smaller package height The total height of the package as shipped. 50.0 inch vs 43.8 inch

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Comparisons ⁷

Make your choice now!

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Quick Take

The essentials that matter—nothing extra

A fast snapshot of the Osaki OS-4000CS, covering its standout specification and what you can expect right out of the box.

Osaki OS-4000CS

The Osaki OS-4000CS massage chair is built with a computerized body scanning system that adjusts the rollers to match the user's spine for accurate massage coverage. Its L-track massage mechanism works from the neck down through the lower back and glutes to deliver consistent full-body therapy. The chair includes zero-gravity reclining, multiple auto massage programs, and air compression massage for shoulders, arms, hips, and legs. With adjustable intensity and built-in heat therapy, it provides a comprehensive relaxation and recovery experience at home.

Specifications & Facts ¹⁷³

Specs measured. Drama avoided.

This is the spec lowdown you actually want. From comfort to customization, we looked into every inch of the Osaki OS-4000CS experience.

General Information ⁷

Osaki OS-4000CS Product Type

What type of massage chair is this?

0 Osaki OS-4000CS 0 Votes Full Body

79 Massage Chairs in this range Full Body

Defines the general classification of the massage chair based on its design and coverage area.

Osaki OS-4000CS Model Number

What is the model number?

0 Osaki OS-4000CS 0 Votes OS 4000CS

40 Massage Chairs in this range SV395

The manufacturer’s reference code for identification or warranty registration.

Osaki OS-4000CS Intended User Height Range

What is the supported user height range?

0 Osaki OS-4000CS 0 Votes 5'0"-6'2"

52 Massage Chairs in this range 5'0-6'2 ft

Indicates the supported height range for optimal massage coverage.

Osaki OS-4000CS Series

What is the chair’s series or model line?

0 Osaki OS-4000CS 0 Votes OS-4000CS

68 Massage Chairs in this range ZGR Plus

Identifies the marketing series or product line to which the model belongs.

Osaki OS-4000CS Country of Origin

Where was the chair made?

0 Osaki OS-4000CS 0 Votes China

36 Massage Chairs in this range China

Indicates where the chair was manufactured or assembled.

Osaki OS-4000CS Release Year

What is the release year?

0 Osaki OS-4000CS 0 Votes 2019

62 Massage Chairs in this range 2025

The year the chair was first released, showing product recency.

Osaki OS-4000CS User Weight Capacity

What is the maximum user weight capacity?

300 lbs 0 Votes

291.49 lbs (Average)

The maximum user weight supported by the chair structure.

Dimensions & Weight ¹²

Osaki OS-4000CS Width

What is the chair’s width?

30.7 inch 0 Votes

30.44 inch (Average)

The total side-to-side measurement of the chair in an upright position.

Osaki OS-4000CS Depth

What is the chair’s depth?

63.4 inch 0 Votes

56.01 inch (Average)

The front-to-back measurement when the chair is in a standard position.

Osaki OS-4000CS Height

What is the chair’s height?

47.2 inch 0 Votes

45.17 inch (Average)

The full height from base to top when upright.

Osaki OS-4000CS Net Weight

What is the chair’s net weight?

226.6 lbs 0 Votes

182.6 lbs (Average)

The total weight of the massage chair without packaging.

Osaki OS-4000CS Seat Width

What is the seat width?

21 inch 0 Votes

20.75 inch (Average)

The width of the seat area where the user sits.

Osaki OS-4000CS Seat Depth

What is the seat depth?

20 inch 0 Votes

20.08 inch (Average)

The measurement from seat front to backrest.

Osaki OS-4000CS Seat Height

What is the seat height?

18 inch 0 Votes

19.99 inch (Average)

The vertical distance from floor to seat surface.

Osaki OS-4000CS Backrest Height

What is the backrest height?

31 inch 0 Votes

31.88 inch (Average)

The total height of the backrest section.

Osaki OS-4000CS Armrest Height

What is the armrest height?

7 inch 0 Votes

23.88 inch (Average)

The distance from floor to top of the armrest.

Osaki OS-4000CS Folded Width

What is the folded width?

31 inch 0 Votes

29.92 inch (Average)

The width of the chair when folded or reclined for storage.

Osaki OS-4000CS Folded Depth

What is the folded depth?

59 inch 0 Votes

51.6 inch (Average)

The depth of the chair when folded or reclined.

Osaki OS-4000CS Folded Height

What is the folded height?

48 inch 0 Votes

43.67 inch (Average)

The height of the chair in a folded position.

Design & Materials ¹¹

Osaki OS-4000CS Color Options

What color options are available?

0 Osaki OS-4000CS 0 Votes Black,Ivory,Brown

67 Massage Chairs in this range Black,Brown

Available upholstery colors for customization.

Osaki OS-4000CS Frame Material

What material is used for the frame?

0 Osaki OS-4000CS 0 Votes Steel

80 Massage Chairs in this range Steel

The primary structural material that supports the chair.

Osaki OS-4000CS Upholstery Material

What is the upholstery material?

0 Osaki OS-4000CS 0 Votes PU Leather

64 Massage Chairs in this range PU Leather

The material covering the chair surface, affecting feel and maintenance.

Osaki OS-4000CS Cushion Type

What type of cushion is used?

0 Osaki OS-4000CS 0 Votes High-Density Foam

73 Massage Chairs in this range High-Density Foam

The internal filling used for comfort and support.

Osaki OS-4000CS Seat Shape

What is the seat shape?

0 Osaki OS-4000CS 0 Votes Ergonomic

77 Massage Chairs in this range Ergonomic

The contour style of the seat that affects posture and comfort.

Osaki OS-4000CS Armrest Type

What type of armrests does the chair have?

0 Osaki OS-4000CS 0 Votes Padded

54 Massage Chairs in this range Padded

Defines the configuration and comfort level of the armrests.

Osaki OS-4000CS Leg Rest Type

What type of leg rest is used?

0 Osaki OS-4000CS 0 Votes Extendable

85 Massage Chairs in this range Extendable

Describes how the leg rest operates or adjusts.

Osaki OS-4000CS Base Type

What is the chair’s base type?

0 Osaki OS-4000CS 0 Votes Fixed

10 Massage Chairs in this range Fixed

Indicates the design and movement capability of the base.

Osaki OS-4000CS Headrest Type

What is the headrest type?

0 Osaki OS-4000CS 0 Votes Padded

55 Massage Chairs in this range Padded

Defines the adjustability and comfort of the headrest.

Osaki OS-4000CS Recline Type

What recline type does it have?

0 Osaki OS-4000CS 0 Votes Zero Gravity

47 Massage Chairs in this range Zero Gravity

Specifies how the chair reclines and the mechanism involved.

Osaki OS-4000CS Cover Removability

Are the covers removable?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Indicates whether the outer covers can be removed for cleaning or replacement.

Massage Mechanism ¹⁵

Osaki OS-4000CS Massage Type

What massage types are supported?

0 Osaki OS-4000CS 0 Votes Kneading, Tapping, Rolling, Shiatsu

65 Massage Chairs in this range Shiatsu, Kneading, Tapping, Rolling

Defines the massage styles available in the chair.

Osaki OS-4000CS Massage Roller Type

What roller type does it use?

0 Osaki OS-4000CS 0 Votes 4D

62 Massage Chairs in this range 3D

The roller system type defining range and depth control.

Osaki OS-4000CS Roller Track Type

What is the roller track type?

0 Osaki OS-4000CS 0 Votes SL-Track

78 Massage Chairs in this range SL-Track

The path shape that the rollers follow along the body.

Osaki OS-4000CS Airbag Placement Zones

Where are the airbags placed?

0 Osaki OS-4000CS 0 Votes Shoulders, Arms, Calves, Feet, Hips

56 Massage Chairs in this range Shoulders, Arms, Calves, Feet, Hips

Identifies where airbags are located.

Osaki OS-4000CS Compression Type

What compression system does it use?

0 Osaki OS-4000CS 0 Votes Air

56 Massage Chairs in this range Air

The system used to create compression pressure.

Osaki OS-4000CS Roller Material

What material are the rollers made from?

0 Osaki OS-4000CS 0 Votes Silicone

55 Massage Chairs in this range Silicone

The material composition of massage rollers.

Osaki OS-4000CS Roller Size

What is the roller size?

1.5 inch 0 Votes

6.71 inch (Average)

The approximate diameter of the massage rollers.

Osaki OS-4000CS Track Length

What is the roller track length?

30 inch 0 Votes

46.02 inch (Average)

The total distance the rollers travel across the user’s body.

Osaki OS-4000CS Number of Massage Nodes

How many massage nodes are there?

0 Osaki OS-4000CS 0 Votes 4

20 Massage Chairs in this range 4

The total count of individual massage nodes operating within the chair.

Osaki OS-4000CS Airbag Count

How many airbags does it have?

0 Osaki OS-4000CS 0 Votes 24

42 Massage Chairs in this range 32

The total number of airbags used for compression and squeezing massage.

Osaki OS-4000CS Shiatsu Function

Does it have Shiatsu massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates if the chair includes shiatsu-style deep pressure massage.

Osaki OS-4000CS Kneading Function

Does it provide kneading massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Determines whether circular kneading motions are supported.

Osaki OS-4000CS Tapping Function

Does it have a tapping massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Checks for rhythmic tapping action for muscle stimulation.

Osaki OS-4000CS Rolling Function

Does it provide rolling massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

States whether continuous roller motion along the back is supported.

Osaki OS-4000CS Dual Action Massage

Can it perform dual-action massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates if the chair can combine two massage types at once.

Massage Programs & Modes ¹⁵

Osaki OS-4000CS Auto Programs Count

How many automatic massage programs are available?

0 Osaki OS-4000CS 0 Votes 8

34 Massage Chairs in this range 12

The total number of built-in automatic massage routines.

Osaki OS-4000CS Massage Focus Modes

Which focus modes are available?

0 Osaki OS-4000CS 0 Votes Neck, Shoulders, Back, Hips, Legs

44 Massage Chairs in this range Neck, Shoulders, Back, Hips, Legs

Predefined focus areas for targeted massage routines.

Osaki OS-4000CS Sleep Mode

Does it include a sleep mode?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Provides a slow, relaxing pattern for pre-sleep comfort.

Osaki OS-4000CS Custom Program Memory

Can it store custom massage programs?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Indicates if users can save their own massage settings.

Osaki OS-4000CS Body Scan Function

Does it include a body scan function?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Detects body shape and adjusts roller or airbag placement automatically.

Osaki OS-4000CS Zone Selection

Can you select massage zones manually?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Allows users to focus massage on specific body areas.

Osaki OS-4000CS Partial Massage Option

Can it perform a partial massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Enables massage to be concentrated on a small section of the body.

Osaki OS-4000CS Full Body Mode

Does it support full-body massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Performs an automated routine that covers the entire body.

Osaki OS-4000CS Quick Massage Mode

Does it include a quick massage mode?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

A fast, time-efficient massage setting.

Osaki OS-4000CS Stretching Mode

Does it have a stretching mode?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Mimics body-stretching movements to relieve tension.

Osaki OS-4000CS Recovery Mode

Is there a recovery mode available?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Focused on post-exercise or fatigue recovery.

Osaki OS-4000CS Manual Control Mode

Can you manually control massage settings?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Allows full user control over individual massage parameters.

Osaki OS-4000CS Speed Levels

How many speed levels are available?

0 Osaki OS-4000CS 0 Votes 3

33 Massage Chairs in this range 3

The number of selectable massage speed levels.

Osaki OS-4000CS Intensity Levels

How many intensity levels can you choose?

0 Osaki OS-4000CS 0 Votes 3

39 Massage Chairs in this range 3

Defines how many intensity adjustments are available for rollers or airbags.

Osaki OS-4000CS AI Adaptive Massage

Does it support AI adaptive massage?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Adjusts massage intensity and pattern based on user tension or response.

Adjustability & Positions ¹⁵

Osaki OS-4000CS Height Adjustment

Does it support height adjustment?

Yes 0 Votes Osaki OS-4000CS

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Allows height alignment for different user sizes.

Osaki OS-4000CS Recline Range

What is the recline range in degrees?

0 Osaki OS-4000CS 0 Votes 115°-170°

55 Massage Chairs in this range 110-160 degree

The maximum angle range through which the chair can recline.

Osaki OS-4000CS Zero Gravity Positions Count

How many zero-gravity positions are supported?

0 Osaki OS-4000CS 0 Votes 1

58 Massage Chairs in this range 3

The number of preset zero-gravity postures that reduce spinal pressure.

Osaki OS-4000CS Seat Angle Adjustment

Can the seat angle be adjusted?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Allows the seat pan angle to be customized for posture support.

Osaki OS-4000CS Legrest Adjustment Range

What is the legrest adjustment range?

0 Osaki OS-4000CS 0 Votes 6

46 Massage Chairs in this range 6

The total extension range of the legrest.

Osaki OS-4000CS Footrest Extension Length

What is the footrest extension length?

6 inch 0 Votes

7.17 inch (Average)

How far the footrest can extend to fit taller users.

Osaki OS-4000CS Shoulder Width Adjustment

Can the shoulder width be adjusted?

Yes 0 Votes Osaki OS-4000CS

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Lets users modify the roller track width for shoulder fit.

Osaki OS-4000CS Armrest Adjustment

Can the armrests be adjusted?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Permits armrest repositioning for ergonomic alignment.

Osaki OS-4000CS Neck Position Adjustment

Can the neck position be adjusted?

Yes 0 Votes Osaki OS-4000CS

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Adjusts neck support height or angle for better relaxation.

Osaki OS-4000CS Lumbar Support Adjustment

Does it support lumbar adjustment?

Yes 0 Votes Osaki OS-4000CS

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Enables fine-tuning of lumbar pressure or depth.

Osaki OS-4000CS Automatic Position Memory

Does it have automatic position memory?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Remembers user’s favorite positions for one-touch setup.

Osaki OS-4000CS Preset Position Modes

What preset position modes are available?

0 Osaki OS-4000CS 0 Votes Zero Gravity

58 Massage Chairs in this range TV, Reading, Nap, Zero Gravity

Predefined recline configurations for convenience.

Osaki OS-4000CS Manual Recline Option

Can it recline manually?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Option to recline manually without power assistance.

Osaki OS-4000CS Backrest Speed Control

Can you control the backrest speed?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Allows control over how quickly the backrest moves between angles.

Osaki OS-4000CS Position Lock Function

Does it have a position lock function?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Locks the current recline position for safety and stability.

Air & Heat Therapy ¹⁰

Osaki OS-4000CS Heating Temperature Range

What is the heating temperature range?

0 Osaki OS-4000CS 0 Votes 104-122°F

61 Massage Chairs in this range 104-122°F

Adjustable temperature range for heating zones.

Osaki OS-4000CS Air Compression Intensity Levels

How many air compression intensity levels are available?

0 Osaki OS-4000CS 0 Votes 3

32 Massage Chairs in this range 3

Number of adjustable intensity levels for air compression.

Osaki OS-4000CS Airbag Material

What material are the airbags made of?

0 Osaki OS-4000CS 0 Votes Synthetic Leather

60 Massage Chairs in this range PU Leather

Material used for the airbags, affecting comfort and durability.

Osaki OS-4000CS Heat Therapy Function

Does the chair include a heat therapy function?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates whether the chair provides heat-based muscle relaxation.

Osaki OS-4000CS Heated Zones

Which body zones are heated?

0 Osaki OS-4000CS 0 Votes Back

79 Massage Chairs in this range Back

Body areas equipped with heating elements.

Osaki OS-4000CS Heating Type

What type of heating technology is used?

0 Osaki OS-4000CS 0 Votes Carbon Fiber

74 Massage Chairs in this range Carbon Fiber

Technology used for heating elements.

Osaki OS-4000CS Heating Duration Setting

What is the heating duration setting?

15 min 0 Votes

20.47 min (Average)

Duration setting for how long heat therapy runs.

Osaki OS-4000CS Automatic Temperature Regulation

Does it have automatic temperature regulation?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Automatically adjusts heating or cooling based on user’s temperature.

Osaki OS-4000CS Cooling Function

Does it include a cooling function?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Provides cooling air or temperature control for user comfort.

Osaki OS-4000CS Safety Temperature Cutoff

Does it include a safety temperature cutoff?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Shuts off heat automatically when temperature exceeds safe limits.

Vibration Features ⁸

Osaki OS-4000CS Vibration Function

Does the chair have vibration functionality?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates whether the chair includes vibration massage capability.

Osaki OS-4000CS Vibration Zones

Which body zones have vibration?

0 Osaki OS-4000CS 0 Votes Seat

77 Massage Chairs in this range Seat, Back, Leg, Foot

Body areas equipped with vibration motors.

Osaki OS-4000CS Target Areas

What are the vibration target areas?

0 Osaki OS-4000CS 0 Votes Upper Back, Lower Back, Seat, Legs, Feet

50 Massage Chairs in this range Upper Back, Lower Back, Seat, Legs, Feet

Specific areas vibration can target for localized relief.

Osaki OS-4000CS Vibration Intensity Levels

How many vibration intensity levels are available?

0 Osaki OS-4000CS 0 Votes 3

42 Massage Chairs in this range 3

Number of selectable intensity levels for vibration massage.

Osaki OS-4000CS Vibration Modes

What vibration modes are available?

0 Osaki OS-4000CS 0 Votes Continuous, Pulse

48 Massage Chairs in this range Continuous, Pulse, Wave

Preset vibration operation patterns.

Osaki OS-4000CS Pulse Pattern Variety

How many pulse patterns are available?

0 Osaki OS-4000CS 0 Votes 2

32 Massage Chairs in this range 3

Number of distinct pulse or wave patterns for vibration.

Osaki OS-4000CS Synchronization with Massage

Can vibration synchronize with massage modes?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Allows vibration to synchronize with other massage functions.

Osaki OS-4000CS Independent Vibration Control

Can vibration be controlled independently?

Yes 0 Votes Osaki OS-4000CS

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Allows vibration to be used or adjusted separately from other functions.

Foot & Calf Massage ¹⁰

Osaki OS-4000CS Foot Massage Function

Does the chair include a foot massage function?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates whether the chair provides dedicated foot massage capability.

Osaki OS-4000CS Calf Massage Function

Does it include calf massage?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Specifies if the chair includes calf compression or roller massage.

Osaki OS-4000CS Foot Roller Count

How many foot rollers does it have?

0 Osaki OS-4000CS 0 Votes 2

37 Massage Chairs in this range 2

The total number of rollers dedicated to foot massage.

Osaki OS-4000CS Foot Roller Type

What type of foot rollers does it use?

0 Osaki OS-4000CS 0 Votes Dual

30 Massage Chairs in this range Dual

Design of the foot rollers affecting massage depth and feel.

Osaki OS-4000CS Calf Airbag Count

How many calf airbags are included?

0 Osaki OS-4000CS 0 Votes 4

35 Massage Chairs in this range 4

Number of airbags providing compression to the calves.

Osaki OS-4000CS Reflexology Function

Does it have a reflexology function?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Uses roller nodes or points to stimulate reflex zones in the feet.

Osaki OS-4000CS Sole Heating Function

Does the chair offer sole heating?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Provides heat to the soles of the feet to enhance relaxation.

Osaki OS-4000CS Toe Massage Function

Is there a toe massage feature?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Provides focused massage around the toes for targeted relief.

Osaki OS-4000CS Ankle Rotation Function

Does the chair support ankle rotation massage?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Rotational mechanism for ankle flexibility and joint relief.

Osaki OS-4000CS Removable Foot Covers

Are the foot covers removable?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Allows foot covers to be detached for easy cleaning or replacement.

Controls & Interface ¹¹

Osaki OS-4000CS On-Chair Controls

Does it have on-chair controls?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Physical controls located directly on the chair for easy access.

Osaki OS-4000CS Control Type

What type of control does the chair use?

0 Osaki OS-4000CS 0 Votes Button, Remote

40 Massage Chairs in this range Remote

The main interface used to operate the massage chair.

Osaki OS-4000CS Control Panel Location

Where is the control panel located?

0 Osaki OS-4000CS 0 Votes Side Panel

36 Massage Chairs in this range Armrest

Where the built-in control panel is positioned on the chair.

Osaki OS-4000CS Control Panel Illumination

Is the control panel illuminated?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates if control buttons or panels are backlit for visibility in low light.

Osaki OS-4000CS Remote Control

Is a remote control included?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

States whether a remote control is provided with the chair.

Osaki OS-4000CS Remote Type

What type of remote does it use?

0 Osaki OS-4000CS 0 Votes Wired

72 Massage Chairs in this range Wireless

Defines whether the remote is connected physically or wirelessly.

Osaki OS-4000CS Remote Display Type

What display type does the remote use?

0 Osaki OS-4000CS 0 Votes LCD

45 Massage Chairs in this range LCD

Type of display used on the remote control.

Osaki OS-4000CS Touchscreen Interface

Does it have a touchscreen interface?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Indicates if the control interface includes a touchscreen.

Osaki OS-4000CS Voice Control Function

Does it support voice control?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Allows users to control chair functions using voice commands.

Osaki OS-4000CS App Control

Can it be controlled via mobile app?

No 0 Votes ~~Osaki OS-4000CS~~

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Allows control through a smartphone app.

Osaki OS-4000CS Child Lock

Does it include a child lock feature?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Prevents accidental operation by locking all functions.

Connectivity & Integration ⁷

Osaki OS-4000CS Bluetooth Connectivity

Does the chair support Bluetooth connectivity?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates whether the chair supports Bluetooth pairing for audio or app functions.

Osaki OS-4000CS Wi-Fi Connectivity

Does the chair have Wi-Fi connectivity?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Shows if the chair supports Wi-Fi for app updates or remote control.

Osaki OS-4000CS Smart Home Integration

Is the chair compatible with smart home systems?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Determines compatibility with smart assistants like Alexa or Google Home.

Osaki OS-4000CS Firmware Upgradable

Is the firmware upgradable?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Indicates whether the chair’s software can be updated for improved features.

Osaki OS-4000CS USB Charging Port

Does it have a USB charging port?

No 0 Votes ~~Osaki OS-4000CS~~

Yes Massage Chairs in this range

Determines if the chair includes one or more USB ports for device charging.

Osaki OS-4000CS Wireless Charging Pad

Is there a wireless charging pad?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

States if the chair features a built-in wireless charging pad for smartphones.

Osaki OS-4000CS Headphone Jack

Does it include a headphone jack?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Indicates whether the chair has a headphone jack for private listening.

Comfort & Ergonomics ¹⁰

Osaki OS-4000CS Ergonomic Design

Does the chair have an ergonomic design?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates whether the chair follows an ergonomic structure for posture support.

Osaki OS-4000CS Cushion Firmness Level

What is the cushion firmness level?

0 Osaki OS-4000CS 0 Votes Medium

29 Massage Chairs in this range Medium

Describes the firmness level of the seat and back cushions.

Osaki OS-4000CS Seat Cushion Thickness

What is the seat cushion thickness?

4 inch 0 Votes

4.42 inch (Average)

Measures the thickness of the main seat cushion for comfort level.

Osaki OS-4000CS Lumbar Cushion Type

What type of lumbar cushion does it have?

0 Osaki OS-4000CS 0 Votes Fixed

60 Massage Chairs in this range Fixed

Defines the lumbar support configuration and flexibility.

Osaki OS-4000CS Armrest Padding

How padded are the armrests?

0 Osaki OS-4000CS 0 Votes Standard

29 Massage Chairs in this range Standard

Specifies the softness and material of the armrest padding.

Osaki OS-4000CS Contoured Backrest

Is the backrest contoured?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

States whether the backrest has a contoured shape for spine alignment.

Osaki OS-4000CS Side Cushion Support

Does it have side cushion support?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Shows whether side cushions provide extra lateral stability and comfort.

Osaki OS-4000CS Head Pillow

Does it include a head pillow?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates if a head pillow is provided for neck comfort.

Osaki OS-4000CS Adjustable Head Pillow

Is the head pillow adjustable?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Specifies whether the head pillow can be repositioned or adjusted.

Osaki OS-4000CS Cooling Ventilation System

Does the chair feature a cooling ventilation system?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Indicates the presence of airflow channels or ventilation to keep the chair cool.

Safety & Protection ⁹

Osaki OS-4000CS Safety Certifications

What safety certifications does it have?

0 Osaki OS-4000CS 0 Votes UL, CE

59 Massage Chairs in this range UL, CE

Lists the official safety certifications obtained by the chair.

Osaki OS-4000CS Overheat Protection

Does it have overheat protection?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Prevents damage or fire by automatically shutting off if components overheat.

Osaki OS-4000CS Overload Protection

Does the chair include overload protection?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Detects and limits excessive electrical or mechanical load.

Osaki OS-4000CS Power Surge Protection

Does it include power surge protection?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Shields the chair’s electrical system from voltage spikes.

Osaki OS-4000CS Auto Shut-off Timer

What is the auto shut-off timer duration?

15 min 0 Votes

18.61 min (Average)

Duration before the chair powers off automatically for safety.

Osaki OS-4000CS Emergency Stop Button

Does it have an emergency stop button?

Yes 0 Votes Osaki OS-4000CS

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Instantly stops all massage functions when pressed.

Osaki OS-4000CS Safety Lock Function

Is there a safety lock feature?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Locks chair functions to prevent accidental use.

Osaki OS-4000CS Flame Retardant Materials

Are the materials flame retardant?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates if chair materials resist ignition or burning.

Osaki OS-4000CS Anti-Tip Design

Does it feature an anti-tip design?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Prevents the chair from tipping over during recline or movement.

Power & Performance ¹⁰

Osaki OS-4000CS Rated Voltage

What is the rated voltage?

110 Volt 0 Votes

112.39 Volt (Average)

The operating voltage required for the chair’s power supply.

Osaki OS-4000CS Rated Frequency

What is the rated frequency?

50 Hz 0 Votes

58.09 Hz (Average)

The electrical frequency required for optimal performance.

Osaki OS-4000CS Power Consumption

What is the power consumption of the chair?

200 Watt 0 Votes

141.44 Watt (Average)

The average electrical power required for full operation.

Osaki OS-4000CS Motor Count

How many motors does the chair have?

0 Osaki OS-4000CS 0 Votes 3

42 Massage Chairs in this range 4

The total number of motors used in the chair.

Osaki OS-4000CS Motor Type

What type of motor does it use?

0 Osaki OS-4000CS 0 Votes DC Motor

36 Massage Chairs in this range DC Motor

Type of motor technology used for massage functions.

Osaki OS-4000CS Motor Power

What is the motor power?

150 Watt 0 Votes

133.26 Watt (Average)

Power rating of each motor or the total motor output.

Osaki OS-4000CS Operating Noise Level

What is the operating noise level?

50 dB 0 Votes

52 dB (Average)

The sound level produced during normal operation.

Osaki OS-4000CS Run Time Limit

What is the run time limit?

15 min 0 Votes

25.44 min (Average)

Maximum continuous operation time before cooldown is needed.

Osaki OS-4000CS Power Cord Length

What is the power cord length?

6 ft 0 Votes

7.48 ft (Average)

The total length of the power cable for flexible placement.

Osaki OS-4000CS Energy Efficiency Rating

What is the energy efficiency rating?

0 Osaki OS-4000CS 0 Votes C

45 Massage Chairs in this range B

The efficiency grade of the chair’s power system.

Maintenance & Durability ⁸

Osaki OS-4000CS Self-Diagnosis System

Does it have a self-diagnosis system?

Yes 0 Votes Osaki OS-4000CS

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Detects internal issues and displays error codes automatically.

Osaki OS-4000CS Cover Washability

Is the chair cover washable?

No 0 Votes ~~Osaki OS-4000CS~~

Massage Chair in this range Who knows? (Help us out by suggesting one!)

Indicates whether the outer fabric or cover can be removed and washed.

Osaki OS-4000CS Maintenance Interval

What is the recommended maintenance interval?

12 month 0 Votes

11.11 month (Average)

Recommended time between routine maintenance checks.

Osaki OS-4000CS Replaceable Components

Does it have replaceable components?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Specifies if key parts (rollers, cushions, etc.) can be replaced when worn.

Osaki OS-4000CS Upholstery Durability Rating

What is the upholstery durability rating?

0 Osaki OS-4000CS 0 Votes 100.000 Cycles

63 Massage Chairs in this range 50.000 Cycles

Rated wear resistance of the chair’s upholstery material.

Osaki OS-4000CS Spare Parts Availability

Are spare parts available for this chair?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates if spare parts are readily available for maintenance.

Osaki OS-4000CS Warranty Duration

What is the warranty duration?

0 Osaki OS-4000CS 0 Votes 3 Year Limited

55 Massage Chairs in this range 3 years

Length of time the product is covered under warranty.

Osaki OS-4000CS Warranty Coverage Type

What type of warranty coverage does it offer?

0 Osaki OS-4000CS 0 Votes Parts & Labor

80 Massage Chairs in this range Parts & Labor

Specifies the scope of the product’s warranty protection.

Package & Installation ⁹

Osaki OS-4000CS Package Weight

What is the package weight?

271.7 lbs 0 Votes

204.27 lbs (Average)

The total weight of the product in its packaging.

Osaki OS-4000CS Package Width

What is the package width?

34 inch 0 Votes

34.41 inch (Average)

The total width of the chair package for delivery.

Osaki OS-4000CS Package Depth

What is the package depth?

62 inch 0 Votes

52.62 inch (Average)

The total depth of the chair package.

Osaki OS-4000CS Package Height

What is the package height?

50 inch 0 Votes

43.8 inch (Average)

The total height of the package as shipped.

Osaki OS-4000CS Delivery Condition

What is the delivery condition?

0 Osaki OS-4000CS 0 Votes Partially Assembled

32 Massage Chairs in this range Partially Assembled

The condition in which the chair is delivered to the user.

Osaki OS-4000CS Installation Type

What is the installation type?

0 Osaki OS-4000CS 0 Votes Partial Assembly

60 Massage Chairs in this range Partial Assembly

Defines how the chair is set up upon delivery.

Osaki OS-4000CS Assembly Tools

Are assembly tools included?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates whether the necessary assembly tools are provided.

Osaki OS-4000CS Installation Time

How long does installation take?

30 min 0 Votes

27.38 min (Average)

Average time required for complete setup and installation.

Osaki OS-4000CS User Manual

Is a user manual included?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

States if a printed or digital user manual is included in the package.

Brand Support & Service ⁶

Osaki OS-4000CS Customer Support Availability

When is customer support available?

0 Osaki OS-4000CS 0 Votes Weekdays Only

62 Massage Chairs in this range Weekdays Only

Defines when customer support is available for assistance.

Osaki OS-4000CS Service Center Coverage

What is the service center coverage?

0 Osaki OS-4000CS 0 Votes National

41 Massage Chairs in this range National

The geographical range of the brand’s authorized service centers.

Osaki OS-4000CS Remote Support Options

What remote support options are available?

0 Osaki OS-4000CS 0 Votes Phone, Email

42 Massage Chairs in this range Phone, Email

Channels available for remote assistance.

Osaki OS-4000CS Replacement Policy

What is the replacement policy duration?

0 Osaki OS-4000CS 0 Votes 30 Days

92 Massage Chairs in this range 30 Days

Specifies the replacement window after purchase for defective units.

Osaki OS-4000CS Extended Warranty Option

Is there an extended warranty option?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

Indicates if users can purchase additional warranty coverage.

Osaki OS-4000CS Accessories Availability

Are accessories available for this model?

Yes 0 Votes Osaki OS-4000CS

Yes Massage Chairs in this range

States if compatible accessories are available from the manufacturer.

Surveys

Because hot takes deserve votes.

Osaki OS-4000CS Comfort

How comfortable is this massage chair during use?

Very comfortable — Provides full body relaxation, perfect pressure and heat 0 Votes

Comfortable — Very good pressure and heat for most users 0 Votes

Average comfort — Decent pressure but might not be ideal for all users 0 Votes

Uncomfortable — Pressure is either too light or too intense, lacks heat 0 Votes

Very uncomfortable — Causes discomfort, poor pressure and no heat 0 Votes

Osaki OS-4000CS Durability and Build Quality

How would you rate the durability and build quality of this massage chair?

Very durable — Built to last for many years with heavy daily use 0 Votes

Durable — Will last for a long time with proper care 0 Votes

Average durability — Moderate wear expected after 2-3 years 0 Votes

Below average durability — Will show signs of wear after 1 year 0 Votes

Poor durability — Breaks or malfunctions within the first year of use 0 Votes

Osaki OS-4000CS Ease of Setup

How easy was it to set up this massage chair?

Very easy — Took under 10 minutes with no tools required 0 Votes

Easy — Set up in under 30 minutes with basic instructions 0 Votes

Average — Took over 30 minutes and required some effort 0 Votes

Difficult — Required multiple people or specialized tools for setup 0 Votes

Very difficult — Setup was complex and time-consuming, unclear instructions 0 Votes

Osaki OS-4000CS Noise Level

How noisy is this massage chair during use?

Very quiet — Operates under 40 dB, virtually silent 0 Votes

Quiet — Operates under 50 dB, can barely hear it 0 Votes

Average noise — Operates around 60 dB, noticeable hum 0 Votes

Loud — Operates around 70 dB, can be disturbing in quiet spaces 0 Votes

Very loud — Over 80 dB, loud enough to be disruptive 0 Votes

Osaki OS-4000CS Design Appeal

How aesthetically pleasing is the design of this massage chair?

Sleek and modern — Stylish, fits with most home décor 0 Votes

Attractive — Good design, blends well with most settings 0 Votes

Neutral — Design is acceptable but not remarkable 0 Votes

Unattractive — Not visually appealing, looks bulky or outdated 0 Votes

Very unattractive — Poor design, does not fit with modern interiors 0 Votes

Osaki OS-4000CS Pricing

How would you rate the price of this massage chair compared to its value?

Great value for money — Worth every penny for the features and quality 0 Votes

Pretty good price — Reasonable cost for the features provided 0 Votes

Fair deal — Average price, but you're getting what you pay for 0 Votes

Kinda pricey — A little more expensive than expected for the value 0 Votes

Crazy expensive — Not worth the price for what you get 0 Votes

Osaki OS-4000CS Massage Features and Customization

How customizable and effective are the massage features on this chair?

Highly customizable — Multiple modes, intensity levels, heat settings, and target areas 0 Votes

Well customizable — Several modes and intensity options, decent heat feature 0 Votes

Average customization — Limited modes or intensity settings, some customization options 0 Votes

Below average — Very few modes or intensity options, minimal customization 0 Votes

No customization — Fixed settings, no way to adjust the massage 0 Votes

Osaki OS-4000CS Performance and Speed

How would you rate the performance and speed of the massage function in this chair?

Very fast and efficient — Delivers quick, effective massage with fast results 0 Votes

Fast — Provides good results in a reasonable amount of time 0 Votes

Average — Massage speed is decent but could be faster or more effective 0 Votes

Slow — Takes longer to feel any significant results 0 Votes

Very slow — Massage is ineffective, takes too long to see any results 0 Votes

Osaki OS-4000CS Heat Function Effectiveness

How effective is the heat function in this massage chair?

Very effective — Provides soothing, deep heat that enhances the massage 0 Votes

Effective — Warmth is noticeable and helps with relaxation 0 Votes

Average — Heat function works but doesn’t provide much relief 0 Votes

Below average — Heat is weak and doesn’t improve the experience 0 Votes

Ineffective — Heat function is practically non-existent or uncomfortable 0 Votes

Osaki OS-4000CS Size and Fit

How would you rate the size and fit of this massage chair for your space?

Perfect fit — Fits seamlessly into any space without being bulky 0 Votes

Good fit — Takes up some space but still manageable in most rooms 0 Votes

Average fit — Large but still workable in most rooms 0 Votes

Below average fit — Takes up a lot of space, difficult to place 0 Votes

Poor fit — Too large or small, doesn't fit well in most spaces 0 Votes

Guides ¹

Yes, we brought proof.

Files ¹

Osaki OS-4000CS Massage Chair User Manual

vitalityweb.com

4 months ago

Reviews ⁰

The good, the bad, and the brutally honest.

Average Rating

Osaki

Osaki OS-4000CS

0 / 5 0 Reviews

Discussions ⁰

Thoughts, takes, and hot debates.

Awards ⁰

Only the best made it here.

Peep the Winners

Collections ⁰

Treasures You’ve picked. No fluff, all fun.

Contributed Users ¹⁷

Crowdsourced brilliance. Or chaos. You decide.

Leila Sloane

8 Contributions

Marcel Kairo

12 Contributions

Hudson Blake

10 Contributions

Emily Bryant

14 Contributions

Layla Maren

12 Contributions

Amayah Rose

11 Contributions

Evie Paige

5 Contributions

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Osaki

Osaki OS-4000CS

Highlights 18

Why is Osaki OS-4000CS better than other massage chairs ?

General Information

Dimensions & Weight

Adjustability & Positions

Vibration Features

Safety & Protection

Power & Performance

Maintenance & Durability

Package & Installation

Comparisons 7

Quick Take

Osaki OS-4000CS

Specifications & Facts 173

General Information 7

Osaki OS-4000CS Product Type

Osaki OS-4000CS Model Number

Osaki OS-4000CS Intended User Height Range

Osaki OS-4000CS Series

Osaki OS-4000CS Country of Origin

Osaki OS-4000CS Release Year

Osaki OS-4000CS User Weight Capacity

Dimensions & Weight 12

Osaki OS-4000CS Width

Osaki OS-4000CS Depth

Osaki OS-4000CS Height

Osaki OS-4000CS Net Weight

Osaki OS-4000CS Seat Width

Osaki OS-4000CS Seat Depth

Osaki OS-4000CS Seat Height

Osaki OS-4000CS Backrest Height

Osaki OS-4000CS Armrest Height

Osaki OS-4000CS Folded Width

Osaki OS-4000CS Folded Depth

Osaki OS-4000CS Folded Height

Design & Materials 11

Osaki OS-4000CS Color Options

Osaki OS-4000CS Frame Material

Osaki OS-4000CS Upholstery Material

Osaki OS-4000CS Cushion Type

Osaki OS-4000CS Seat Shape

Osaki OS-4000CS Armrest Type

Osaki OS-4000CS Leg Rest Type

Osaki OS-4000CS Base Type

Osaki OS-4000CS Headrest Type

Osaki OS-4000CS Recline Type

Osaki OS-4000CS Cover Removability

Massage Mechanism 15

Osaki OS-4000CS Massage Type

Osaki OS-4000CS Massage Roller Type

Osaki OS-4000CS Roller Track Type

Osaki OS-4000CS Airbag Placement Zones

Osaki OS-4000CS Compression Type

Osaki OS-4000CS Roller Material

Osaki OS-4000CS Roller Size

Osaki OS-4000CS Track Length

Osaki OS-4000CS Number of Massage Nodes

Osaki OS-4000CS Airbag Count

Osaki OS-4000CS Shiatsu Function

Osaki OS-4000CS Kneading Function

Osaki OS-4000CS Tapping Function

Osaki OS-4000CS Rolling Function

Osaki OS-4000CS Dual Action Massage

Massage Programs & Modes 15

Osaki OS-4000CS Auto Programs Count

Osaki OS-4000CS Massage Focus Modes

Osaki OS-4000CS Sleep Mode

Osaki OS-4000CS Custom Program Memory

Osaki OS-4000CS Body Scan Function

Osaki OS-4000CS Zone Selection

Osaki OS-4000CS Partial Massage Option

Osaki OS-4000CS Full Body Mode

Osaki OS-4000CS Quick Massage Mode

Osaki OS-4000CS Stretching Mode

Osaki OS-4000CS Recovery Mode

Osaki OS-4000CS Manual Control Mode

Osaki OS-4000CS Speed Levels

Osaki OS-4000CS Intensity Levels

Osaki OS-4000CS AI Adaptive Massage

Adjustability & Positions 15

Highlights ¹⁸

Comparisons ⁷

Specifications & Facts ¹⁷³

General Information ⁷

Dimensions & Weight ¹²

Design & Materials ¹¹

Massage Mechanism ¹⁵

Massage Programs & Modes ¹⁵

Adjustability & Positions ¹⁵

Air & Heat Therapy ¹⁰

Vibration Features ⁸

Foot & Calf Massage ¹⁰

Controls & Interface ¹¹

Connectivity & Integration ⁷

Comfort & Ergonomics ¹⁰