Description features:DY-S001 massage chair function 1. This product is designed with a four-wheel driven muted massage 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 massage functions of Shiatsu, kneading, flapping, vibration and kneading flapping synchronous, and designed urgency 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 machine hand massage. Also can be adjusting by your hand. 4. Provides six kinds of educational massage functions of shiatsu, kneading, flapping, knocking, simultaneous kneading and flapping, and vibrating and four mode of air massage ,including the entire body, the shoulder and neck, the back and waist , lower body , music simultaneous massage and way as stated in the Chinese medicine massage theory. 5. Manual mode: It can independently or combine the methods of massage act. Five levels of speed respectively. Under the massage modes of flapping, shiatsu and knocking, the width between the two massage hands is adjustable with three levels of wide, middle and narrow. The massage 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 adjust the width of massage wheels. 7.