Features: Dimension: 8.66 Inch * 8.86 Inch * 1.97 Inch (22cm*22.5cm*5cm) USB cable length: 4.3 FT (1.3M) Inside: 7.9 Inch * 8.7 Inch (20 x 22 cm) USB Warmer Mouse Pad with built-in warmer pad can help warm your freezing cold hand while you are at work. The temperature of the mouse pad will go up to a suitable degree after it is connected to the computer. Just plug it into the USB port, then you can warm your hand all the time. The power needed is 5V. This is safe. Current: approx 450ma Operating voltage: 5V ± 0.5 Temperature range: 40 ~ 50 °C