Keep you warm on cold -the heater is easy to carry. Drink your favorite morning of hot at your desk at work, or keep a hot of hot tea while relaxing on the sofa. Ideal gift for /tea lovers. Beverage thermostat---The tea heater has a built-in thermostat, which can keep your beverage (tea, , milk tea, etc.) at the temperature from the first sip to the last drop (50-80). Please note that the desktop USB heating coaster can only be used for heat preservation and cannot boil water. Safe and durable---USB heater is made of high-quality walnut wood and metal materials, which is evenly heated, safe and durable to use, with natural walnut wood grain and smooth hand feeling. USB Port ed --- Any device with an output 5V USB port, such as computers, desktops, laptops, tablets, mobile power supplies, etc. The compact design keeps the drink warm throughout the day. It is an excellent gift for lovers. On , and , dad, mom, wife, husband and all your loved ones. Suitable for most mugs --- The heater is suitable for most mugs, such as glass s, stainless steel s, ceramic s, etc. For better results, we recommend using a flat-bottomed glass or stainless steel . Putting a lid on the will also help retain heat.