USB hub cup warmer ( KX-C01) 1.4 USB 1.1 ports a type female connectors downstream 1 USB b type male connector upstream with a cable　　 2. Support both full-speed 12Mb/sec and low-speed 1.5Mb/sec transfer rates　　 3. Chains up to 127 USB devices　　 4.Individual port over-current protection　　 5.Provide up to 500mA per port sufficient for diverse devices 6.Truly plug & play automatic installation　　 7.DC jack for selectable 　　 8.Keep coffee/tea/drink warm at 50-60°C　　 9.Easy installation, no driver required, plug & play　　 10.Rated power:2.5W-5V DC　　 11.With on/off switch　　 12.Red LED indication when warmer is turned on.　　 13.Quality insulation material around the metal hot plate prevents burns.　　 14.USB powered, no batteries needed. System requirements : IMAC, G3, G4 or Book with available USB port.　　 IBM PC 48D*4-100MHz or higher　　 OS:Win95/SE/ME/2000/XP