Cup Mug Warmer Auto Thermostat Coffee Tea Milk Drink Heater Pad for Office Home Product Feature: USB Power Supply: Place a cup with water on the aluminum plate, short press the switch button, the indicator light will light blue, start heating, keep the temperature at 55°, and short press again to turn off. Constant Temperature: Plug in and use, it can maintain a constant temperature throughout the day. Scope of Application: Compatible with most tumblers, metal, glassware, milk cartons, plastic cups and more. Portable: Safe and energy-saving, light and portable, easy to carry, and will not take up too much space. Safe and Durable: The coaster warmer is made of ABS material, and the panel is made of aluminum heating plate material, which can slow down the cooling speed of hot drinks. Product Specification: Type: Intelligent Thermostat Warm Coaster Quantity: 1 Color: Blue/Green/Pink Size: 13x10x2cm (5.12x3.94x0.79in) Shell Material: ABS Panel: Aluminum Heating Plate Power Supply: USB Temperature: Constant Temperature At 55°C Power: 16w Package Included: 1 x Thermostat Warmer Coaster