Interface: USB 2.0,4 ports;
Support high speed 480Mpbs,fully speed 12Mpbs,low speed 1.5Mpbs;
Plug & play and hot switching;
Over-current protection;
Compatible with all USB devices;
Keep coffee/tea/drink temperature at 50-60℃;
Red LED indication when warmer is turned on;
Hight quality insulation material around the hot plate;
USB power, no need battery;
Rated power: 2.5W-5V DC;