Description: Material: Iron shell+Aluminum plate Size: 10.3 * 1.6cm/4.06 * 0.63inch Color: Black Feature: 1. USB power supply: USB insulated coasters can be powered through a USB interface, making it easy to connect various power devices such as computers, power banks, etc. without the need for additional power cords, making it more convenient to use. 2. Constant temperature insulation: Supports constant temperature insulation function, which can keep the beverage in the cup at a constant temperature, avoiding overheating or overcooling, allowing you to enjoy warm beverages at any time. 3. Safety protection: Equipped with multiple safety protection mechanisms, such as overheating protection and leakage protection, to ensure safety during use. 4. Wide applicability: USB insulated cup coasters are suitable for various cup types, such as glass cups, ceramic cups, stainless steel cups, etc., and can be widely used in offices, homes, cars, and other occasions. Attention: 1.Due to manual measurement, there may be a 1-3mm error in product dimensions. 2.The color of the product may have errors due to objective reasons, and the actual product is the main focus. The product includes: 1 * USB insulated coaster