KEEP YOUR COFFEE WARM: This insulated mug not only slows down the cooling of hot coffee, but also heats your coffee up to 120-140(40-60). At this temperature throughout the day, it's neither too hot nor too cold, so you can drink your coffee anytime without waiting. For Office and Home Desk Coffee, Milk, Tea, Water, Christmas/Birthday Gift Warming Plate (Black) Auto Sleep: The cup warmer intelligently senses when to turn on and off. It goes into sleep mode when the cup is empty or after 5 minutes of inactivity. 2 heating gears, 1st gear is high temperature gear, 2nd gear is low temperature gear, can be adjusted arbitrarily. Compatible with most mugs: Waterproof tempered glass acts as a warm heating surface for mugs, keeps mugs warm Heat and fire resistant Suitable for metal, ceramic, enamel, tile, high temperature plastic, glassware and more. Putting a lid on the mug will also help keep it warm, thin-walled flat-bottomed mugs hold the best heat. Automatic Timing/Waterproof: The cup warmer is made of aluminum alloy, with a waterproof and easy-to-clean conductive glass surface, no need to worry about the safety of occasional spills, easy to clean. A total of 1-9 hours can be adjusted, and the time can be set at will to keep the cup warm. Don't worry about forgetting to turn it off. Make sure your glass is heat resistant. BEST GIFT CHOICE: The coffee warmer has a humanized and natural design concept, which keeps drinks always warm. It will be the best gift choice to express your care to your family, lover or friends on Valentine's Day, Thanksgiving Day, Christmas, New Year, Father's Day or other special occasions.