The USB Mouse Hand Warmer is a blanket pouch made of fleece and a non-slip surface with a USB plug and an infrared heating element. It measures about 12” x 12” and holds just about any size computer mouse and mouse pad. This style Mouse Hand Warmer uses electricity generated from your computer. There’s one USB cord which is connected to a USB port on your computer, and located on the cord is a safe and easy disconnect to unplug the heated device when not in use. See the pictures. The Mouse Hand Warmer blanket creates a cozy cover for your cold mouse hand. The infrared heating element is positioned in the center of the fleece blanket and keeps the mouse hand warm. It’s like crawling under the covers of an electric blanket on a cold winter’s night. The low, 5V wiring is safe for computers and people. If you or someone you know has cold hands when using the computer, an USB Mouse Hand Warmer will create the perfect mouse hand environment. The USB Mouse Hand Warmer is hand washable and air dryable. After hand-washing, dry the Mouse Hand Warmer completely prior to using it. Instructions: Slip your favorite computer mouse and mouse pad inside the Mouse Hand Warmer blanket pouch. The Mouse Hand Warmer is compatible with an USB mouse or a wireless mouse. If using an USB connected mouse, cut a small slit in the net at the end of the Mouse Hand Warmer. When using a wireless mouse, the net opening creates a clear optical connection.