1. Four driven wheels on the backrest
2. Back massage mechanism with four massage mode of kneading, tapping, knocking,finger pressing
3. Vibrating massage and air pressure massage on seat cushion
4. 3D roller mechanism design
5 . Air pressure massage for footrest
6 . Rolling massage for feet
7 . LCD display to show the using time
8 . Auto alarm function, when some user sit in the chair without enough coins
9 . Intelligence identify system, accept paper money