With a USB beverage warmer, you will never have to drink cold tea or coffee again. It is very easy to use - just plug it into the USB port of your computer or laptop and it will keep your drinks hot. What more could you want? Try this stylish heater at least once and you will never stop using it again. You will even wonder how you could have lived without him so far. The product has a low voltage (5V) and does not require the installation of any drivers. It is suitable for ceramic mugs and cups, it is not suitable for heating plastic cups.Don't call, just SMS!