Description: This cup warmer mat is made of high quality walnut wood and metal materials, heating evenly, safe and durable to use, has natural walnut wooden grain and smooth to touch. It powered by any devices with output 5V USB port, such as your computer, desktop, laptop, tablet, mobile power and so on, easy and convenient. Great for use at home and office, keeping you brew warm on cold days. Features: Made of high quality walnut wood and metal materials, 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. Light weight and compact size, easy to carry and suitable for most stainless steel cup, feeding bottle, ceramic cup, glass cup, etc. Keep your coffee, tea or other hot beverage warm up to 80℃, do not worry about high temperature and high oxidation, safe in use. Great for use at home and office, keeping you brew warm on cold days. Specification: Condition: 100% Brand New Main Material: Iron + AlumInium Type: Black, Water bead pattern, white porcelain pattern (Optional) Power: 5W Voltage: 5V Electric Current: 1000mA Maximun Working Temperature( At Normal Temperature ): 80℃ Wooden Grain Width: Approx. 16mm / 0.62inch Metal Plate Diameter: Approx. 75mm / 2.95inch Whole Diameter: Approx. 103mm / 4.05inch Package Included: 1 x Cup Warmer with USB Cable (Cups are Not Included) Note: Please don't use the recessed bottom cup, mineral water bottles, adiabatic vacuum cups or cups with thick bottom. It is only used to keep your tea or coffee warm, but not for heating. Please allow slight deviation for the color and measurement. Thanks for your understanding. .