USB Cup Warmer 1.USB Coffee warmer,Cup Warmer 2.Truly plug & play automatic installation 3. USB powered, no batteries needed USB Cup Warmer--Truly plug & play automatic installation-- ... power:2.5W-5V DC--With on/off switch--Red LED indication when warmer is turned on.--Quality insulation ... , G3, G4 or Book with available USB port.--IBM PC 48D*4-100MHz or higher--OS:Win95/SE/ME/2000/XP USB Cup Warmer