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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 131℉/55℃, 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: Thanks to the microgravity technology, 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.