1) This massage is powered by USB connector and suitable for computer operating staff. small size, easy to use. 2) Massage human body for shoulder, thigh, waist, neck, back side, feet and hands 3) One touch on/off switch 4) Vibration speed: 4500 rpm 5) USB power: 4.0 - 5.5V (150mA) 6) Product Size: Dia. 6.5x3.7 cm 7) Weight: 100g 8) 1.5 meters long USB cable. 9) Different colors are available 10) This USB massage ball only for massage purpose, not for medical treatment Color Box Packing Info: -Carton Quantity:100pcs/CTN -Dimension:43x34x62cm -N.W: 10Kgs -G.W: 11Kgs China supplier: Email : fangzhengcn@hotmail.com Skype ID : chanceller819 http://chinagift.en.ecplaza.net