| Maintain optimal temperature: This Coffee mug warmer not only can slow down the cooling speed of hot coffee, But also can heat your coffee up to 70Celsius-80Celsius, and keep this temperature whole day,which is neither too hot nor too cold, you can sip your coffee at any time, without waiting.Easy to use: This coffee warmer can shut off/on auto. Just plug the adapter into outlet, then put your mug on and the cup warmer will work auto, take it , the cup warmer will off auto. Powered by any devices with output 5V USB port, such as your computer, desktop, laptop, tablet, mobile power and so on, easy and convenient.Suitable for most cups: The electric coffee cup warmer can be fit most cups, such … | |