2-in-1 Temperature ButtonYou can get a customized temperature by touching our electric mug warmer 2-in-1 high-sensitivity touch button, it can warm up the coffee/ drinks to 104, 131 and 149. Auto Shut OFFWith an"Shut OFF" function for our mug warmer, it countdown from your last press of the button after working continually 6 hours. Note: long press the "touch button" for 2 seconds to turn it off. Waterproof Design Our coffee mug warmer is integrated with 20W low power heating body made of waterproof tempered, even splashing water on the heating plate by accident, there is no risk for security concern, safe and reliable. Heating PlateThis mug warmer adopted nickel heating wire applied in the heating plate, with the thermal efficiency is higher than ordinary heating wire, which keeps the coffee, beverages, milk, tea warm evenly. (Note: Please don't expect coffee cup warmer as a heater or keep your coffee super hot.) Flat Bottom MugOur electric beverage warmer is designed for flat bottom mugs, that can make your mug bottom in full contact. Suitable for tableware: metal, ceramic, enamel, tile, high temperature plastic, glassware, etc.