The coffee warmer heats the surface of your vacuum coffee cup evenly, keeping your drink at a constant temperature and maintaining the temperature throughout the day so the temperature is pleasant.Intelligent gravity induction switch of the cup heater, the water cup will automatically heat up after placing the roller coaster, and the water cup will automatically cut off the power when leaving the roller coaster to avoid dry burning, which is safer! Very suitable for drinking milk, tea, coffee and water.If you accidentally spill liquid into your coffee mug warmer, rest assured that it is waterproof. The electric cup warmer has a waterproof panel, so don't worry about safety, because you only need to dry it with a cloth. Note: Do not pour water on it.Our electric cup warmer includes a thermos and a teaspoon