Features:It designed to keep your coffee, tea or other hot beverage warm up, do not worry about high temperature or high oxidation, safe in use.Made of high quality material, heating evenly, safe and durable to use.Powered by any devices with output 5V USB port, such as your computer, desktop, laptop, tablet, mobile power and so on, easy and convenient.Suitable for most flat bottom cup, feeding bottle, ceramic cup, glass cup and etc, great for use at home and office, keeping you brew warm on cold days.. Color: Blue, Materials: ABS, Size: One Size: 14.4cm x 11cm x 2.5cm, Care: N/A