The main differences between fixed point, 2D, 3D, and 4D massage chairs lie in their capabilities and the level of customization they offer in the massage experience:

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• Fixed Point Massage Chairs: Fixed point massage chairs use stationary massage heads or rollers to provide massages. The massage nodes move in a specific pattern and are fixed in place, targeting predetermined points along the back and other areas. The massage is consistent and may not be as adjustable or customizable compared to chairs with movable rollers.

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• 2D Massage Chairs: 2D massage chairs have rollers that can move up and down and side to side, providing a two-dimensional movement. Users can adjust the intensity of the massage, but the rollers remain at a fixed depth. The massage is primarily along a flat plane and follows a predetermined pattern without adjusting to the contours of the body.

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• 3D Massage Chairs: 3D massage chairs have rollers that can move up and down, side to side, and can protrude in and out (adding a third dimension). Users can control the depth of the massage, allowing the rollers to reach deeper into the muscles or stay at a more surface-level massage. This provides a more customizable and lifelike massage experience as the rollers adapt to the contours of the body.

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• 4D Massage Chairs: 4D massage chairs are the most advanced, integrating all the features of 3D rollers with an additional dimension—speed variation. In 4D chairs, the speed of the massage strokes is adjustable, mimicking the variability and rhythm of a human massage. This dynamic adjustment in speed, in addition to movement and depth, creates a highly customizable, dynamic, and natural massage experience.

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In summary, fixed point massage chairs have stationary massage nodes, 2D chairs offer up-and-down and side-to-side movements, 3D chairs add an adjustable depth dimension, and 4D chairs include speed variations for an even more lifelike massage. The progression from fixed point to 4D represents an evolution towards a more customizable and human-like massage experience.