Osaki OS-4000 Review 2020

Whether it's the most frequently asked questions you are in search for regarding the Osaki OS-4000 Massage Chair or its core features or even any problematic components, this post will have all your queries fully covered.

Most of all; however, this post by the time you are done reading it will significantly help you in deciding upon whether to opt for the final purchase of the Osaki OS-4000 Massage Chair or not.

Without further adieu, let's get right to it!

Osaki OS-4000 Massage Chair
  • Computer Body Scan System, True Ergonomic S-Track, Upgraded PU covering for Increase Durability and Comfort
  • Six unique Pre-Set Programs, Easy-to-use Large LCD Display Remote with Wireless Remote, 2 Stage Zero-Gravity Positioning...
  • Foot, Calves, Arm, Hips and Shoulder Air Pressure Massage; Hips and Lumbar Squeeze; Auto Timer Setting from 5-30 minutes...

If you have made it till this page, it would probably be for considering the purchase of the Osaki OS-4000 Massage Chair. If that is; however, the case, then let me tell you, you have come to the right place.

Osaki as a brand has been among the world's most renowned names within the realm of technological goods and in specific, massage affiliated products.

The OS-4000 Massage Chair is no exception, making its way among the top 10 massage chairs of 2020, the OS-4000 has integrated within a vast number of features suitable for not only sheer relaxation but also to enhances the process of physical recovery. 

os 4000 review

The Osaki OS 4000 massage chair has it all; whether it is a contemporary design you are in search of or a highly reasonable price or even an extensive set of highly advanced massaging features integrated within, this particular massage chair model will have you fully satisfied,

An extensively detailed review of the core features the Osaki OS-4000 has to can be found below while this section will pertain to a little overview of the components which makes this chair among the top massage chairs. 

A fully active body scanning system aids with catering users of varying body types with a consistent massage as well as allows for a higher level of personalization to take place.

Alongside, air massage technology is utilized to deliver a subtle and relatively sensitive massage experience for those that prefer it better.

To get to know more about the massage features integrated into the OS-4000 Massage Chair, keep on reading!

Major Specifications - Osaki OS 4000 

  • Product Name: Osaki OS -4000
  • Model No. : OS-4000
  • Vertical Side : 38L x 25W x 15H
  • Gross Weight: 255 lbs
  • Main Body Dimension : 52L x 31W x 34H (inches)
  • Length of the wire: Controller wire: 1.2m
  • Power Supply Wire: 2.1m
  • Rated Voltage: 110-120V
  • Rated Frequency: 50/60 Hz.
  • Auto Timer: 5/10/15/20/25/30 minutes

Pros Vs. Cons


  • Higher personalization is offered via manually choosing massage timing between 5-30 minutes; following which an automatic shut-off timer is activated.

  • PU leather as upholstery significantly enhances durability.

  • Shoulders and the hips are targeted explicitly via an air pressure massage system.

  • Two different zero-gravity positions help achieve maximum relaxation.


  • Rollers functioning inside the backseat of the massage chair are relatively subtle.

  • The written text upon the controllers is excruciatingly tiny, making it arduous for users to be able to read in a dimly lighted room successfully.

  • The chair weighs a total of 260 pounds and is delivered unassembled; making it extremely challenging and time-consuming to assemble.

  • The massage chair comes with only a 3-year limited warranty.

Core Features of the Osaki OS-4000

features of osaki os 4000

Integrated Specialized Automatic Massage Programs

The OS-4000 has integrated within a total of six different massage programs, each of which is specially designed to achieve optimal results for relaxation, rejuvenation, recovery and relieve.

Each massage program is strategically set with the aid of experts within the field, and are aimed at delivering either recovery, relief, rejuvenation, and relaxation with the help of a combination of varying intensities, speeds, massage motions, and timing.

Manual Massage Programs

Alongside the already pre-programmed massage settings within the OS-4000, customers also have the option of being able to alter their chosen massage motion via the ability to select from among five varying levels of massage intensity and speed, to best achieve their desired results.

An additional six manual massage motions are also among the massage settings of the OS-4000. Users can create customized massage patterns from among a combination of Kneading, Swedish, Rolling, Tapping and two others to best be able to cater to their desire or mood.

Automatic Body Scanning Technology

The automatic body scanning system of the OS-4000 delivers precision during the massage therapy via rollers by being able to adjust the positioning of the rollers per the body width as well as body height of its users.

Regardless of whether you may be 5’3 or 6’3, consisting of all types of body-frames, broad or narrow, short or tall, an automatic body scanner caters all body types with an equivalent standard of relaxation.

Taking the feature of body scanning one step further, Osaki also included an additional function of Leg-scanning to be able to avoid users from facing any discomfort during the time they receive the leg and foot massage.

Updated Air-massage Technique

The OS-4000 has manufactured within it, airbags alongside air cells, to be able to efficiently achieve the highest level of comfort via massaging not only the hips along with the lumbar area of users but also, the shoulders, arms, foot and the calf of users.

Alongside increasing comfort, the integration of airbags with air cells also significantly increases the aggregate massage coverage area being delivered to each user. Such an extensive area coverage ensures an efficient full body massage experience being offered to users.

Two Control Systems

The primary controller of the Osaki OS-4000 Massage Chair is of full-size, which allows users to be able to control all the key and secondary massage chair functions.

The second controller of the OS-4000 is highly advanced due to being wireless, unlike the primary central controller. The compact size of the wireless remote serves the purpose of users being able to alter the main settings of the OS-4000 without having to interrupt the comfort of a reclined position while utilizing the massage chair.

Zero-gravity Alongside an Ergonomic S-track

The Ergonomic S-track technology is utilized by the OS-4000 to be able to monitor the placing of the spine on the back-seat of the massage chair, following which, the massage motion is contoured in accordance to each idiosyncratic spinal cord placing of users.

Along with allowing the massage nodes to contour to the unique Vertebrae of each user fully, the Ergonomic S-track also ensures that all core acupuncture points located within the back of users are efficiently targeted.

A 2-stage feature of zero-gravity is also among the main components which make up the OS-4000. Each stage of the zero-gravity positioning, guarantee that a gradual incline takes place for the eradication of unnecessary strain being targeted upon the spine of the user.

Efficient Heating System

The OS-4000 also has a heating system integrated within, as one of its principal features. For a higher level of efficiency, instead of one, two separate heating pads are placed within the lower back area of the massaging chair to ensure that maximum massage motion penetration can take place to achieve optimal comfort.

Two separate pads also serve the purpose of significantly increasing the aggregate area to which heat is delivered; therefore, aiding in the effectiveness of the massage being provided via enhanced massage penetration.

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User Feedback

The overall input received by the users of the Osaki OS-4000 was average leading to a whole three stars being awarded by users out of an aggregate of 5 stars.

The Osaki OS-4000 Massage Chair was definitely above satisfactory levels for all those whom of which give higher preference to a relatively more softer and subtle massage experience.

While those that were accustomed to more intense massage sessions did have a few complaints regarding the delivery of a non-effective massage session.

os 4000 user feedback

The most prominent form of complaint noticed within customer feedback was due to a prolonged time being consumed to set up the Osaki OS-4000. Some customers even went on to state that more than one person was required just for the cause of assembling the massage chair.

Those that mostly complained about the problematic assembly also pointed out the lack of effective communication via the user manual as well as the massage chair itself being too bulky to assemble. See for yourself!

Problems Experienced

osaki os 4000 problems

The difficulty with assembling the Osaki OS-4000 is among the core issues of the massaging chair itself, not only does it weight a hefty amount; it also comes along with a rather difficult to understand user manual which makes things more complicated.

For some users, the Osaki OS-4000 may deliver too subtle of a massaging experience than their liking; this, however, solely depends upon personal preferences of the user themselves.

While some customers may be unhappy with the soft massage sessions, at the same time, a different user might be fully satisfied with the softness of the messages being delivered via airbags.

Where to Buy Osaki OS-4000

where to buy osaki os 4000

If you have finalized upon the purchase of the Osaki OS-4000 Massage Chair; however, wish to order it online via reliable sources, then I have you fully covered. When dealing with online purchases, it is best to sell with only the most credible and reliable of sellers, an example of whom can be found below;

Osaki OS-4000 Massage Chair
  • Computer Body Scan System, True Ergonomic S-Track, Upgraded PU covering for Increase Durability and Comfort
  • Six unique Pre-Set Programs, Easy-to-use Large LCD Display Remote with Wireless Remote, 2 Stage Zero-Gravity Positioning...
  • Foot, Calves, Arm, Hips and Shoulder Air Pressure Massage; Hips and Lumbar Squeeze; Auto Timer Setting from 5-30 minutes...

Most Frequently Asked Questions

frequently asked questions about osaki os 4000

1 - Where is this made?

The Osaki OS-4000 Massage Chair is made in China.

2 - Does this chair work the glutes or just the back? 

The massage settings integrated within are primarily for relieving the back, then the glutes although massage coverage does cater to the glutes.

3 - I'm 6'2" 200 lbs. Will I fit in this chair? 

Yes, you should fit into it with much ease and find the Osaki OS-4000 to work well for you.

4 - Is it FDA Approved? 

The Osaki OS-4000 is not categorized as a medical device; therefore, is not FDA approved.

5 - How many airbags does this chair have? 

An aggregate of 14 airbags is integrated within the OS-4000 Massage Chair.

6 - Is it synthetic leather? 

Yes, upholstery is in the form of PU leather.

7 - Does this chair have heat in the feet area? If not, so you have any models that do?  

No, the Osaki OS-4000 does not cater the feet of users with heat therapy. Other models have Foot and Calf massage, but not heat massage, i.e., the Osaki OS-3D PRO Intelligent Massage Chair.

8 - How hard are the rollers? I've sat in somewhere it hurts. 

The Osaki OS-4000 has adjustable intensity varying from very relaxing massage to a relatively intense massage session.

9 - How long for factory warranty? 

A 3-year limited warranty is delivered alongside the Osaki OS-4000.

10 - How many boxes does it come with if I do curbside delivery? 

The OS-4000 is shipped in a total of 2 boxes.


I prefer massage settings which are considerably higher in intensity to be able to thoroughly enjoy the relaxing experience being delivered by a massage chair. The Osaki OS-4000 consists of massage settings within the lower back area which were too subtle for my liking, which was a drawback specifically for me.

For those, unlike me; however, give preference to massage motions that are relatively softer on the body as well as subtler, I would highly recommend the Osaki OS-4000.

Other than the issues above, the Osaki OS-4000 is a massage chair which consists of all essential message features and can deliver consistently high-level massage therapy that too at an affordable price range due to which, I would recommend it to prospective buyers.

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