USB warmer , Keep coffee/tea/drink warm at 50-60C, USB powered,no external power needs; , With On/Off switch; USB warmerGreat quality and competitive ... driver required, plug & play 3) USB powered,no external power needs4) Red LED indication when warmer is turned on.5) Insulation material ... prevents burns.6) With On/Off switch;7) Color:white USB warmer (Keep coffee/tea/drink warm at 50-60C, PM-UC ...