we can supply USB Coffee Warmer Here are brief introduction of our company: Shenzhen YiXin Electronics Co., Ltd. Is a research and develop, produce, sell and OEM promotion gift, electronic gift, advertisement gifts as an organic whole enterprise.The headquarters will be located in Hong Kong,That is a Yixin Industry International Group's subordinate enterprise, will use the mainland of China produce product low cost the comprehensive superiority。 1.Keep coffee/tea/drink warm at 50-60℃ 2.Easy installation, no driver required, plug & play 3.Rated power: 2.5W-5V DC 4.Red LED indication when warmer is turned on. 5.Quality insulation material around the metal hot plate prevents burns.