USTOP&trade; popular Soft USB Heated Mousepad/Hand Warmer/USB Powered Heated Mouse Pad Voltage: 5V & absolute security products warm in seconds later but the temperature will not over 40 centigrade low power: 2.5W , spent 1 KWH in 25 days,save power Length of USB Cable:1.3m Warm your hand while you are working on computer, Lively and comfortable