DY-A4 function 1. This is designed with a four-wheel driven muted mechanism which can move up and down in the backrest and thirty-two airbags inside.Fashionable and classic modeling, adjustable back and calves support. 2. It provides four artificial functions of Shiatsu, kneading, flapping, vibration and kneading flapping synchronous, and designed urgent stop bottons. 3. Ajust the sit gesture automatically when boot-strap, reposition automatically when turning off. According to the height of human body,it can check and measure the area of hand .Also can be adjust by your hand. 4. Provides five kinds of emulational functions of shiatsu, kneading, flapping,knocking, simultaneous kneading and flapping, and vibrating and four mode of ,including the entire body, the shoulder and neck, the back and waist , lower body , way as stated in the Chinese medicine theory. 5. Manual mode: It can independently or combine the methods of act.Five levels of speed respectively. Under the modes of flapping, shiatsu and knocking, the width between the two hands is adjustable with three levels of wide, middle and narrow. The hands are vertically and accurately movable to fit your position in the state of the fixed back stretch. 6. Width of massage: Under manual mode flapping and Shiatsu, it could freely ajust the width of . 7. Air : Designed shoulder, buttock, thigh , calf parts,sole(parenthesis vibration) and hand massage, have two levels of intensity moved. 8.Fitting up three groups to vibrate the (back, buttocks, leg), but the independence or the union with two levels of intensity.9. The function to heat up seats, it can be switched independently. 10. Manually controlled provides the large liquid seven colored tablets.