Smart 55 Degree Constant Temperature Coaster Winter Desktop Insulation And Warm Heating Usb Coaster Details: 1. Material: glass-ceramic panel 2. Weight: about 500 grams 3. Size: about 132x118x20 mm 4. Rated input: 5V-2A 5. Power: 10W 6. Application: glass pot, ceramic cup, glass cup, boxed milk, plastic cup, etc. 7. Note: only coasters, not the cups and other items in the picture Features: 1. Intelligent touch switch, automatic power-off protection, convenient and worry-free 2. Focusing constant temperature at 55°C 3. Three-level temperature control with one button (low temperature range 70 degrees Celsius medium file 90 degrees Celsius high temperature range 110 degrees Celsius) 4. PTC technology with metal panel heating faster 5. Sound effect reminds drinking water function 6. Lightweight and portable, beautiful and practical 7. USB interface, safe power supply