1.Personified mechanic massage hands in the back ties with the vibration rolls. Various massage functions can be synchronous, meanwhile opening the kneading rols. 2.Four airbags in the back and waist. 2 long-shaped airbags, 1 quadrate airbag and 1 vibration roll in the seat cushion, 8 airbags in the calf support. 3.While the calf support rising to the top, it can stretch out 8cm automatically. That can satisfy the length while lying.