Description: This cup warmer mat is made of high quality walnut wood and metal materials, heating evenly, safe, 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. Specification: Condition: 100% Brand New Main Material: Wood + Metal Type: Bright Wooden Grain, Dark Wooden Grain (Optional) Power: 5W Voltage: 5V Electric Current: 1000mA Max Working Temperature: 80℃ Wooden Grain Width: Approx. 16mm / 0.62inch Metal Plate Diameter: Approx. 75mm / 2.95inch Whole Diameter: Approx. 103mm / 4.05inch Weight: Approx. 108-109g 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 withthick 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. Features ?【Ideal Hot Beverage Coasters】The milk mug warmer is suitable for coffee, tea, hot cocoa and any other beverage that needs to be heated at home, office or outdoor events. It always keeps a hot drink for you. ?【High Quality Material】The electric coffee warmer is made of high quality walnut and metal materials, which are heated evenly, keeping the temperature of coffee or other hot drinks above 80℃, without worrying about high temperature and high oxidation. ?【Easy Power Supply】This mug warmer mat is powered by a device with a 5V USB output port, such as your computer, desktop, laptop, tablet, power bank, etc., all can be powered. ?【Lightweight and Portable】This beer warmer is lightweight, compact in size and easy to carry, suitable for most stainless steel cups, bottles, ceramic cups, glass cups, etc. ?【Note】The diameter of the cup required for this plate warmer must be smaller than the heating plate cross-section, and must have a completely flat base, not concave or any ridged edges. Without this, there wouldn't be enough contact to heat the liquid in the cup.