Product description Main material: iron shell + aluminum sheet Type: Light Wood Grain, Dark Wood Grain ? Matte Black Power: 5W Voltage: 5V Electric current: 1000mA Max working temperature: 80 ? Wood 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) 1. ?Material? This cup warmer mat is made of high quality metal materials, evenly heated, safe and durable, has walnut wood grain pattern and is smooth to the touch. The felt base design prevents scratches on the table top. 2. ?Compact size? Small size and easy to carry, suitable for most stainless steel mugs, baby bottles, ceramic mugs, glass mugs, etc. 3. ?Function? The surface temperature of the aluminum sheet can reach 70-80 C ? Keep coffee, tea or other hot drinks at 55 C, no worry about high temperature and high oxidation, safe to use. Do not touch the electric fever panel when the USB warmer is working to prevent burns. 4. ?Power supply via USB port? Any device with a 5V USB output such as computer, desktop, laptop, tablet, mobile power supply, etc. 5. ?Usage? Suitable for home and office, keep you warm on cold days.