USB Heated Mouse Pad Hand Warmer Mouse Pads with Wristguard Bear Claw Coffee 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. Lovely design,beautiful and practial,suit for home and office desk. Please note that the heater is separated from the mouse pad. You can choose to use or don't use the heater when using the warm mouse pad. Dimensions: the diameter is about 30cm.