USB Plate+1 USB Port: keep coffee, tea, or other drink warm at 50-60°Spec:-  easy installation, plug & play, no driver required
-  rated power:  2.5W-5V DC
-  with on/off switch
-  red LED indication when warmer is turned on
-  quality insulation material around the metal hot plate prevents burns 
-  USB powered, no batteries needed
-  Instructions in English
-  One usb extend port