USB Power Suply Coffee Tea Mug Warmer Heating Cup Mat Pad Coasters Home Office Use Silver Practical and durable, keep coffee, tea and other hot beverage warm at 45-50C Rated voltage: 2.5W-5V DC, single on/off switching system, there is the red led light when heating Hot metal plate attached to the insulating material to prevent burns Material: Plastic+aluminum alloy; Input: DC 5V 500-1000mA Cup Pad Size: Approx. 4.06*3.70*0.83inch/10.3*9.4*2.1cm