Features: 1Quick Heating Coaster: This USB coaster can quickly warm coffee to a constant temperature, so you can enjoy a warm drink in no time. 2Automatic Power Off Function: For safety reasons, the coaster is equipped with automatic power off function, when the temperature reaches the set value, it will automatically turn off the heating function to avoid overheating and save power. 3For Worker and Kids: Designed for workers and students, it provides a warm companion for busy work and study, so that you can enjoy a warm drink at any time and refresh your mind. 4Widely Applicable: Whether it's coffee, drinks, milk, tea or hot chocolate, this coaster keeps your drink at a constant temperature and keeps it tasting. 5USB Interface Portable Use: The coaster can be directly connected to a computer, mobile power supply or other USB devices through the USB interface, easy to carry and use, no additional power outlet is required. Specification: Item Type: Coffee Cup HeaterPower: 10W-18WHeating Diameter: Approx. 65mm /2.56 inches5V: up to 65C/149F9V: up to 118C/244FCooling Temperature: Minimum 2C/35FWeight: 442g/15.6ozSize: 155 x 55mm/6.1 x 2.2inMaterial: ABS aluminum alloy Package List: 1 x Host1 x USB Data Cable