1.Massage human body for Shoulder, Thigh, Waist, Neck, back side, Feet and Hands, etc. 2.One touch ON/OFF switch. 3.Vibration speed : 3600 r.p.m 4.USB power : 4.0 ~ 5.5V (150mA) 5.Dimension : 85mm x 43mm 6.Weight : 147g only. 7.1.8 meters USB Cable. 8.Enjoy massage in your car + Car to USB Adapter. * This USB Massage Ball only for massage purpose, not for medical treatment.