usb cup warmer with usb hub, usb warmer, usb gadget usb cup warmer with usb hub, usb warmer, usb gadget1. 4 ports USB hub2. Supports both full-speed 12Mbps and low ... play automatic installation, Easy installation, no driver required5. Use USB power, no batteries needed6. On/off switch and LED ... zone diameter: 75mm8. Build-in +5V DC jack.... usb cup warmer with usb hub, usb warmer, usb gadget