Ariic New Cute USB Coffee Cup Powered Tea Beverage Mug Warmer Heater Red Keep warm cup. Water capacity: 270ml. Powered by USB port. Reliable hot temperature. With different shape. Note:It's used to keep your tea or coffee warm,not to heate your water to 100??C Hot water. 1. Powered by USB port. 2.Reliable hot temperature, highest 50-60??C. 3.Durable stainless steel interior. 4.Hand wash recommended, due to electronic parts. 5.Easy installation, no driver required, plug & play. 6.12oz cup keeps your beverage hot. 7.Size: 133 x 100 x 100mm.