A Mug Warmer For You To Keep Your Coffee/Tea/Beverage/Drink/ Warm Just Enjoy It Freely If you work with a computer and like to get coffee or tea while working, this USB beverage warmer can keep your beverage warm with just plugging it into your computer - The low-energy constant temperature control system keeps your drink at just the right temperature. - Safe and Reliable: Coffee warmer for desk use Low power heating body made of silicone. It is safe. It has 5W low power heat focusing, fast heating. - It can use about 100 thousand hours. Suitable for tableware: metal, ceramic, enamel, tile, high-temperature plastic, glassware etc. Product Specifications: Product Name: USB Insulation Coaster Material: Iron Shell + Aluminum Plate Voltage: 5V Power Supply Method: USB Diameter: 103mm/4in Height: 16mm/0.6in Cable Length: 1m/39in Power: 5W Current: 1000mA Weight: 115g User's Guidance: 1. Soak tea in hot water at 100℃. 2. Connect the USB Plug 3. Place the cup on the insulated base and keep the tea above 70℃. NOTICE: 1. Beverage warmers work better if the mug you are using has a flat bottom which means the heater can hit the whole bottom surface. 2. Please choose a flat bottom mug to use on this ceramic surface as well avoid tall or high volume mugs. 3. We recommend to use a lid if the mug is wide or very tall. 4. THIS BEVERAGE WARMER IS NOT DESIGNED TO HEAT UP DRINKS, IT IS ONLY DESIGNED TO KEEP DRINKS WARMER FOR LONGER PERIODS OF TIME. CAUTION: 1. Do not put hand on ceramic face when the warmer is working to avoid scalding. 2. Keep out of the reach of children and pets to avoid any accidents. 3. Use with care.