Coffee warmer for desk one-button control, three-level temperature adjustment, constant temperature insulation, large screen display, mute. You can easily control the temperature with the click of a touch button to keep liquids at 131'F, 149'F or 167'F (55'C, 65'C or 75'C). Diameter of the bottom coaster is less than 3 in, which can prevent the cup from accidentally slipping and overturning. Suitable for most cups such as metal, glass, milk paper, cans, china and baby bottles. 8 hours automatic shutdown is safer, don't worry about forgetting to shutdown. To have temperature, but also to be safe. Please use the 5V=2A charging port to charge the product, the 5V voltage can reach 220 voltage, and the temperature is the same.