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-speed ... indicator7. Heating zone diameter: 75mm8. Build-in +5V DC jack.... usb cup warmer with usb hub, usb warmer, usb gadget