USB Powered: Hand warmer mouse mat is heated via USB, which is more secure and will not cause any electrical damage. Timing Function: This heating mouse pad with a timing switch, it can automatically turn off the power when the working time out. Removeable: The heating pad of this USB mouse pad can take out, easy to clean. Mouse Mat: The hand warmer mat has space inside is large enough to move the mouse freely without stuck. Adjustable Temperature: USB mouse pad temperature can be adjusted according to your needs, there are three temperatures you can choose freely.