It can work with Windows XP, 2000, ME, 98. Mac OS 8.6 or above.Simply plug it into a spare USB port on your computer and the Cup Warmer will keep your beverage at the optimum operating temperature for as long as you care to leave it! As we have a solution to yourtepid tea dilemma in the rather lovely form of our USB Cup Warmer! Feature: 4 port high speed USB HUB. Keep coffee, tea and other drink warm. Individual port over current protection. Ergonomic design and very portable. Plug and play installation. Easy installation no software required. 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. Voltage: 5V Power: 2.5W Current: 500-1000mA Weight:85g Demension:9.3 x 10.2 x 2cm USB cable length:92cm Note: In order to keep the drink warmer, it is better to use a stainless steel cup. package included: 1 x 4 Port USB 2.0 Hub 1 x Manual