Safety FirstThis coffee cup warmer is safer to use. It adopts cup induction technology. After the coaster is placed, the water cup is automatically heated, and when the coaster is left, the water cup is automatically powered off. Don't worry about forgetting to turn it off, make sure your glass is heat-resistant. Constant Temperature Coffee Cup WarmerThe 55°C smart constant temperature coaster is compact and portable, making it easy to store at home and office. Use thin-walled, flat-bottomed cups to get the best heat preservation effect. DurableThe mug warmer adopts a toughened glass waterproof panel, which is durable. The base of the cup is light and thin, the temperature is constant, and it is easy to carry when going out. Portable DesignOffice health experts, heating coasters only need palm-sized space, are small in size, do not occupy desktop space, and can help the desktop to keep tidy at any time. Exquisite GiftThe insulation coaster is made of aluminum alloy, and has a waterproof and easy-to-clean conductive glass surface, which is suitable for different scenarios. This small vacuum flask is both stylish and functional. It is the perfect Thanksgiving, Christmas, birthday, Valentine's Day, etc.