4 port high speed USB HUB. Keep coffee, tea and other drink warm. * Plug and play installation. USB powered, no batteries needed. * Keeps coffee, tea or drink warm at 50oC - 60oC while you work. On/Off switch. * Red LED indication when warmer is turned on. Compatible with any computer with spare USB port. * Work with Windows XP, 2000, ME, 98. Mac OS 8.6 or above