4D Massage Chairs
A 4D massage chair is an advanced type of massage chair that features 4D massage technology. This technology is an upgrade over 3D massage technology, which only allows the rollers to move in three dimensions (up and down, side to side, and in and out). 4D massage technology adds an additional dimension of movement, which is the speed of the roller movement. It allows the chair to adjust the speed of the massage rollers in real-time, providing a more realistic and dynamic massage experience.