USB WIRED CHARGING FUNCTION: The USB mug warmer can not only warm your drinks, but also can charge your phones, cup warmer is corded only, but the added USB output port can use a charging cable to connect to your mobile phone (Applicable to iPhone cable). Make your life more warm and convenient..USB COFFEE MUG WARMER: This cup warmer has passed UL certification, US plug, keeps your favorite drinks warm at constant temperature(131℉/55℃). And add a USB output port, you can charging your device while enjoy warm coffee, which is convenient and fast..CUP WARMER WITH GRAVITY SWITCH: The coffee cup heater has built-in gravity induction switch, You only need to put a cup(0.8lbs/13oz)on thethe base, cup warmer will automatically turn on and warm up, and just remove the cup it will stop heating. Easy to use, no need to manually turn off the switch..HIGH QUALITY USB COFFEE MUG WARMER: Warmer plate is made of high quality metal materials that heat evenly and are safe and durable.There is an indicator switch, you can clearly know whether the coffee cup warmer is working properly. Stylish mug warmer is a best choice as a gift, and big enough to satisfy the needs of the user and keep warm..WARM GIFT CHOICE: USB mug warmer very suitable for home and office use, keeping you warm in cold weather. And easy to clean with the glass panel design, just clean it with a towel. Suitable for flat ceramic,glass, stainless steel cups, baby bottles. Coffee warmer will be your fine gift choice to show your care to your families, lover or friends on Thanks giving, Valentine's day, Christmas or other special occasions.