8 massage heads installed with good speed and intensity Equipped with 4 massage heads with far infrared effect Comfort and effective rolling massage Massage to back and waist Relax and cure strain of lumbar muscles Press manual key change from auto to manual mode Press strength in manual mode to adjust intensity of rolling When power on, press infrared to turn on/off infrared function Relative lights in massage heads on with heating effect Stops automatically in 15 minutes indicating with three DI DI DI sound