Keep your drink warm with your computer There's nothing worse than crafting the perfect cup of coffee, only to let it go cold because you got distracted by someone flapping their gums about their weekend. Instead, this mug warmer keeps your drink warm with your computer's USB port! Simply plug it in, and place your ceramic mug on top. The results? A nice warm drink, ready to sip. it's a donut-shaped USB mug warmer (finally!) compatible with Mac, PC, Chromebooks, etc uses just (1) USB port convenient on/off button works with any ceramic mug Material: ABS Milk coffee mug 55 Celsius heating thermostat pad Gravity sensor switch, when the cup is put, it starts immediately, intelligent constant temperature, quickly heating at 55 Celsius . Beautiful color , made of Tempered glass，high quality. Perfect for ceremic milk mug, coffee mug, office cup. 1 Set Cup+spoon +Heating pad, great gifts for friends collegues