e-Warmer Heated USB Mouse, Silver (Hand Wamer) ONE-YEAR WARRANTY. See Description for details. Designed with a 5V Carbon Fiber Heating Element producing INFRARED HEAT. Uses a USB Port on the Computer with a cord approximately 50-55" long and a H/L/O inline switch (color may vary) on the cord USB optical style heated computer mouse 99-104 degrees Farhenheit temperature Ergonomically shaped, Light weight, Plug & play, PC/MAC compatible Solves the cold mouse hand problem providing infrared heat to the palm of the mouse hand