Feature: 1. Intelligent coaster, supports both heating and cooling, one‑key cooling and constant temperature heating. 2. The semiconductor refrigeration chip consumes less power and improves the speed of heat preservation/cold preservation. 3. Suitable for most flat‑bottomed cups, beverage cans, cans, ceramic cups, glass cups, stainless steel cups, etc. on the market. 4. Simple appearance, plug and play, with USB interface, compact and portable, suitable for office and home. 5. Using ABS engineering plastics, it has strong durability and durability, anti‑leakage, and high safety. Specification: Item Type: Electric Cup Mat Material: ABS Engineering Plastic Product Color: White Product Model: C-100+ Rated Power: 10W Product Voltage: 5V/2A Weight: Approx. 465g / 16.4oz Effective Line Length: 93cm / 36.6in Product Size: Approx. 140x90x35mm / 5.5x3.5x1.4in Package List: 1 x Heating Cooling Coaster 1 x English Manual Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. Double‑layer cups and thick bottom cups are not suitable. It is recommended that the bottom of the cup be flat. 4. The function of this product is to keep warm and cold. It cannot be used to boil water.