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 away, 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 glass cup,stainless steel cup, Ceramic cup etc. for better results, we recommend using flat bottom glass cup or stainless steel cup. Placing a lid over the mug will also help retain heat.Best gift choice: keep the beverages(Coffee, tea, milk etc) warm whole day, making it a great gift for lover, dad, mom, wife, husband, grandparents and all your loved ones on Valentine's day, Thanksgiving and Christmas, and other special occasions to express your sincere care.Good for your health: This coffee warmer is a great choice for keeps your body warm all day, great helper to creat a better life. It is very mini to carry but it provides comfort and happiness as well.Working Voltage: 5V 2AUse Power: 8WModel: USB Charging Weight: 181g colour:WhiteMaterial:ABSsize:125 x 22mmPackage Contents:1 x coffee warmerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.