Features:
1) Massage human body for shoulder, thigh, waist, neck, back side, feet and hands
2) One touch on/off switch
3) Vibration speed: 3,600rpm
4) USB power: 4.0 - 5.5V (150mA)
5) Dimensions: 85 x 43mm
6) Weight: 147g
7) 1.8 meters USB cable
8) Enjoy massage in car: car to USB adapter
9) This USB massage ball is only for massage purpose, not for medical treatment