Usb heated coffee mug 1),Usb keep warm coffee mug 2),High quality coffee mug 3),Low voltage and Safe 4),Hot sale coffee mug usb heated coffee mugSpecifications Mirror Compact USB keep warm coffee mug:1) Come with USB Port, 1m Cable length.Features:1,To pour the water(25°C) into the cup and plug the USB cable into the computer USB port.2,The water temperature have risen to 35-45°C after 1-2 hour.3 ...