4.Luxury Pu with Extra thin with 5.6cm 5.4-roller mechanism from upper back to lower back; 6.Massage area can be chhose; 7.3 massage modes is selectable, upper shiatsu, down shiatsu, full shiatsu; 8.Spot massager. when you press "upper"button about 3 second the shiatsu ball can stop in any upper place do to point by point massager for you. when you press "down"button about 3 second the shiatsu ball can stop in any down place do to point by point massager for you. 9.Smoothing heat on massage heads 10.15 minutes auto-off timer;