During cold season drinking a cup of warm coffee is the best thing to do, but if you are a busy person and you don’t have the time to go to the kitchen to boil some water then you might want to get this USB cup warmer. This USB gadget is very simple, you just need to connect it on a USB port and place your cup on its USB-powered hot plate. This gadget is low voltage rated at 5V and includes DC to USB cable. It can keep your coffee warm at 40 degrees when placed on the hot plate after an hour. The USB cup warmer does not require any driver or software and it only cost £4.99.