1.【Note】 In order to make the coffee heating faster, this coffee heater needs a bit of power (5V3A, 9V2A, 5V2A), the general computer USB connection may not be powered, it is best to use a fast charging charging head connection (mobile phone fast charging can be). If you plug it in and long press the touch switch and it doesn't turn on, it's not enough power. Those who mind are cautious!!! 2. 【Warmer Quick】Mug warmer automatic switch with heating and constant temperature function. Keeps all your favorite beverages to hot or warm, Hot plate coffee warmer for desk make the drink taste more delicious. NOTE: Do not put anything on the heater except the cup or mug. 3. 【Auto Shut Off】 This coffee cup warmer is made of waterproof tempered glass and ABS flame-retardant material. This mug warmer for desk comes with 10 hours auto shut off function that prevents any possible safety problem caused by forgetting to shut the warmer down. 4. 【Applicable with Most Cups】Our smart electric coffee mug warmer has a wide range of applications, also can normally used for cups made of metal, enamel, ceramics and glassware, you can also use it as a candle warmer. 5.When it used as a gift, it is also for your family, friends and lovers ideal for gifts