Feature:1. The USB cup coaster is convenient to use and operate. Just connect the computer USB interface to provide power for the mat.2. Suitable for cups that can withstand high temperatures and have a bottom diameter of 65mm and below.3. Cooling and heating functions are suitable for you to meet different needs in different occasions.4. Portable and light in weight, the USB cup warming cooling pad is easy to carry and store.5. Made of high‑quality ABS and metal, the product is sturdy, wearable and durable.How to Use:After connecting the power, press the switch to the left, the indicator light is blue, indicating that it is cooling; press the switch to the right, the indicator turns red, indicating that it is heating; the switch is kept horizontal to turn off.Specification:Item Type: USB Cup CoasterMaterial: ABS, MetalPower: 10-18WInput Power: 5V-9V 2AHeating Diameter Of Variable Temperature Table: Approx. 65mm / 2.6inApplicable Cups: Cups That Can Withstand High Temperatures And Have A Bottom Diameter Of 65MM And BelowCooling Temperature: 5V Power Supply, As Low As 10℃; 9V Power Supply, As Low As -3℃Heating Temperature: 5V Power Supply, Maximum 70℃; 9V Power Supply, Maximum 118℃ Package List:1 x USB Cup Coaster1 x USB Cable1 x User Manual