This mug warmer makes the perfect holiday gift for anyone who drinks a lot of coffee or tea. It simply plugs into a USB port on a computer and it's ready to go (no software required). Hot plate surface heats up to 150°F (60°C) to keep contents comfortably warm. It features an on/off switch so that it can stay plugged in even when the warmer is not in use. 44" USB cord included.