USB Cup Warmer, USB coffee warmer USB powered, no driver&play,USB fridge USB promotion gift, USB gifts, USB Gadgets,USB produc 1) Keep coffee/tea/drink warm at 50-60°C2) Easy installation, no driver required, plug & play 3) USB powered,no external power needs; 4) Red LED indication when warmer is turned on.5) Insulation material around the metal hot plate prevents burns.6) With On/Off switch; ...