Features 4 port high speed USB HUB Keep coffee/ tea/ beverage warm at 50-60 degrees Individual port over current protection Ergonomic design and very portable Plug and play installation Work with Windows XP, Vista, Win 7, Mac OS 8.6 Powered by USB port, no battery required On/Off switch Red/Green LED indication Easy installation no software required Power: 2.5W 5V DC Compatible with any computer with spare USB port Contents 1 x USB Cup Warmer & 4 Port Hub