USB Cup Warmer with Gravity Sensor Switch 55°C Constant Temperature Coffee Mug

1 x Cup Heater(Cup does not include). Built in thermostat for keeping your beverages at the perfect temperature from the first sip to the last drop(55℃/131℉). Colour: White/Green(optional). Suitable for ceramics, glass, stainless steel and other heat resistant containers.

eBay