What do the technical terms mean?

3D massage

Rollers move up and down, side to side and in or out. Adjustable depth changes how firmly they contact your body.

4D massage

Adds variations in speed and rhythm to 3D roller movement. The settings and behavior differ by model.

5D massage

Osaki’s model-specific description for advanced pressure-responsive massage. It is not an industry-wide certification or a simple rating above every 4D chair.

Acupressure

A massage style that applies focused pressure at selected points. It describes a technique, not a guarantee of a medical outcome.

Additional back pad

An extra cushion softens the feeling of the back rollers without changing the mechanism itself.

Adjustable massage settings

Controls for roller depth or intensity, speed and air pressure let you change the feel of a massage. Settings and scales are model-specific.

Air cell / airbag

An inflatable chamber used for compression massage. Air-cell numbers and their locations vary between chairs.

Air compression massage

Air cells inflate and release to apply a rhythmic squeeze. They complement roller massage in areas such as the arms, shoulders, calves and feet. Cell count alone does not measure quality.

Alexa compatibility

Alexa control requires a supported Alexa device or phone app and setup. It is different from built-in voice recognition.

App control

A model-specific iPhone or Android app offers chair controls on your phone. App availability and phone compatibility can change.

Arm rollers

Mechanical rollers massage the arms. They are different from arm airbags, which apply compression.

Aromatherapy

A scent feature adds fragrance near the chair. Compare it as a comfort preference, not a treatment or guarantee of a health benefit.

Attachable magnetic pillow

A pillow can attach magnetically to the chair. Master’s instructions recommend moving it to the side before shoulder massage.

Automatic programs

Preset routines combine massage movements, air compression and other settings. Program quantity is not a quality rating.

Automatic shoulder adjustment

The body scan sets the massage position to your shoulder height. Some chairs also measure shoulder width.

Available colors

Colors available in the current Shopify product options. Images and availability can vary by variant.

Bluetooth speakers

Connect a compatible device to play audio through the chair’s speakers. Bluetooth audio does not necessarily mean app control.

Body scan

Body scanning locates body contours or shoulder position to set the massage rollers for your frame. Automatic describes a scan triggered by starting the chair or a massage program; it does not mean continuous scanning. Computer, Smart and Attentive are manufacturer names, not separate operating modes. Real-time scanning adjusts as your position changes during massage. Pressure sensors may also adapt during a session and are listed separately. Body scanning is different from Health Pro or health detection. See each chair’s manual for its startup and position-adjustment steps.

Calf kneading

Moving calf mechanisms or rotating air massagers knead the lower legs. Air compression alone is a different action.

Chair weight

The unpacked chair weight, separate from shipping weight. Consider access, floor loading and delivery arrangements.

Customizable timer

A setting changes the duration of a massage. The available time range varies by model.

Duo — Dual massage mechanisms

Duo means the chair has two separate massage mechanisms. They can work on different areas at the same time: typically one massages the back while the other targets the glutes and upper thighs. The combination varies by model, such as 4D + 3D or 5D + 4D.

Flexible SL-Track

A track that changes its shape or extends with the recline position, allowing a different stretch position from a fixed SL-Track.

Foot rollers

Rotating rollers massage the soles of the feet. A count per foot is different from the total number of rollers in the footrest.

Footrest adjustment type

Automatic or motorized adjustment moves the footrest electrically. A spring-loaded section responds to leg pressure. Some chairs combine more than one type.

Footrest extension

How far the leg rest lengthens to accommodate different leg lengths. The mechanism may be motorized, automatic or spring-loaded.

Fully reclined dimensions

The chair’s width × length × height in its fully reclined position, in inches. This footprint is different from the rear wall gap.

Health Pro

Master and the Maestro LE 2.0 manual describe a contact-sensor program that assesses fatigue and torso tension, then suggests a massage. It is not a medical assessment.

Heated foot rollers

The foot rollers provide warmth while massaging the soles, rather than heating only through surrounding pads.

Heated massage rollers

The massage heads themselves provide warmth as they travel along the roller path.

Heating shawl

A separate heated shawl is placed across the torso to add warmth at the chest or stomach.

Heating temperature

The approximate warmth range published for the heating pads. This describes the pad temperature, not room temperature or a medical treatment.

Heating therapy

Heating pads, coils or heated rollers add warmth to selected areas. Compare the actual heating locations rather than only the number of zones.

Infrared heating

A manufacturer-described heating system that adds warmth. Compare its location and controls rather than assuming a medical benefit.

Intelligent health detection

A manufacturer-described sensor program uses readings such as heart rate, blood oxygen or fatigue to suggest a massage. It is a personalization feature, not a medical diagnosis.

Kneading

A circular, pressing movement intended to imitate the working motion of hands.

Knocking

A repeated percussion-style massage movement, distinct from continuous rolling.

LED mood lighting / chromotherapy

Decorative lighting helps set the atmosphere. Chromotherapy is the manufacturer’s name for a color-light feature; it is not a demonstrated medical treatment.

Lumbar air massage

Airbags add compression or support at the lower back. This is separate from the main back roller system and lumbar heating.

Manual massage modes

Individual massage styles you can select and adjust yourself. Some manufacturers count variations of one technique as separate modes.

Manual massage styles

Names of the individual techniques listed for a chair. Similar names can describe different movements across models.

Massage mechanism

The roller system that moves along the chair’s track. 3D adds adjustable depth to vertical and sideways movement. 4D also varies speed and rhythm. Osaki uses 5D for pressure-responsive features on specific models; the numbers are not a universal quality score.

Maximum user weight

The manufacturer’s maximum supported user weight. It is a limit, not a recommended comfort target.

Minimum doorway

The stated passage width for delivery. A disassembled width assumes specified parts have been removed. Measure the whole delivery route and confirm installation arrangements.

Muscle tension detection

Health Pro uses contact sensors to assess torso tension and guide a suggested massage. A body scan alone does not provide this function.

Negative ionizer

A built-in device releases negatively charged ions into nearby air. Its presence is an equipment feature; it does not establish a stress-relief, energy or medical benefit.

Package dimensions

Shipping-box width × length × height in inches. A chair may arrive in multiple boxes; these are different from the assembled chair dimensions.

Package weight

The weight of each packaged shipping box, including packing material. This is different from unpacked chair weight.

Power supply / frequency

The manufacturer’s specified electrical supply. Use the voltage and frequency in the chair’s manual.

Quick side control panel

Buttons or a dial on the armrest provide shortcuts without navigating the full touchscreen.

Reflexology rollers

Foot rollers with shaped ridges apply pressure to the soles. The name describes the roller design, not a proven whole-body health effect.

Removable headrest

The pillow can be removed to change cushioning and how directly you feel the massage. Follow the model’s setup instructions.

Rolling

A smooth roller movement along an area of the back or feet.

Rubbing

A manufacturer-named technique using a rubbing-style motion. Check the model’s manual for the available adjustments.

Seat width

The manufacturer’s stated seating width. This does not describe every part of the usable space or guarantee a comfortable fit.

Segmented armrest airbags

Separate arm and palm airbag sections inflate in a sequence to create a moving compression sensation.

Shiatsu

A style using focused, repeated pressure. In a chair it is a programmed roller motion inspired by the hands-on technique.

Shoulder airbag massage

Airbags around the shoulder area inflate and deflate to provide compression massage. This is separate from dedicated shoulder massage nodes.

Shoulder massage nodes

Additional massage nodes beside the shoulder pads provide a localized shoulder motion. These are distinct from ordinary shoulder airbags.

Shoulder width

The stated shoulder-area width. Width definitions differ between models, so compare body fit and the complete seating area as well.

SL-Track

A curved roller rail follows the back and continues beneath the seat toward the glutes and upper hamstrings. Coverage depends on the chair and the user’s position.

Sleep / deep recline mode

An additional reclining position intended for a more laid-back session. This is distinct from an automatic program named Sleep.

Sliding side doors

Side panels open to make entry and exit easier. These are different from side control panels.

Smart pressure sensors

Sensors help the massage mechanism respond to changes in contact or body position during a session. This is different from the initial body scan.

SORA mode

Trion’s group of programs that use its alternating Walking Technology leg-rest movements.

Spot / partial massage

Spot massage holds the rollers around a selected area. Partial massage works a shorter section of the track instead of the full path.

Stretch program

A routine combines reclining movements, roller massage or air compression to change your posture. The track and mechanism determine how a chair performs it.

Swedish massage mode

A manufacturer-named chair program inspired by flowing massage movements. It is not the same as a hands-on Swedish massage.

Sync massage mode

A manufacturer-named manual movement that coordinates massage actions. Its exact motion depends on the model.

Tapping

Rhythmic, repeated contact by the massage rollers.

Touchscreen controller

A touch-sensitive display lets you select programs and adjust massage settings.

Upright dimensions

The chair’s width × length × height in its upright position, in inches. Check the full delivery path as well as the room where it will sit.

USB charging port

A wired charging connection for a compatible device. Check the connector type and charging requirements.

User manual

The model’s instruction manual covers setup, safety, controls and the supported preset voice commands.

Vibration

Rapid, small movements add a vibrating sensation in the supported massage area.

Voice commands

Preset spoken commands control supported functions. Built-in voice recognition and Alexa control are different systems; use the commands in the model’s manual.

Walking Technology

Trion’s independent leg rests alternate in a scissor-like motion that mimics walking, gently stretching the lower back, glutes, hamstrings and the area around the knees. This adds assisted movement and stretching to the lower-body massage while you remain seated—useful if you want more than compression and foot rollers alone. The feature is available through SORA Mode programs.

Wall clearance

The minimum rear gap advertised for reclining. Space-saving chairs slide forward as the back lowers. Allow room in front too, and follow the installation manual.

Wi-Fi / controller updates

A network connection can support controller functions or updates where the manufacturer specifically lists them.

Wireless phone charging

A charging surface powers a compatible phone without a cable. Phone support, case thickness and positioning affect charging.

Zero Gravity reclining

A reclined position raises the legs and changes weight distribution. Stages are preset positions; they do not mean literal weightlessness or an industry-wide quality ranking.