Feature:1. USB warmer coaster for coffee, milk, tea, etc.2. The heating temperature is 40℃, can't be used to boil water. Power saving, only 0.16kwh for 24hours heating time.3. It can be used for paper box milk, mugs, baby nursing bottle, milk tea, cans, etc.4. Small size, portable, you can take it to office. Waterproof pad face, safer for use.5. Practical: This cup warming coaster allows you to enjoy a warm drink anytime, perfect for cold days or winter.Specification:Specification:Item Type: Cup Warming CoasterMaterial: Aluminum, Stalinite Color: Black Size: 10.2cm Power By: USB Package List:Package Include:1 x Cup Warming Coaster 1 x USB Cable Note:Note: 1. Manual measuring, please allow 1-3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.