Coasters features: M05 LED Smart Constant Temperature Coaster, Multi-function Heat Preservation Reminder To Drink Water Heating Coaster Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. A variety of gears and different temperatures to meet your needs. 24H warm waiting, only 0.48 kWh of electricity is needed. Double heating efficiency, faster to give you the temperature you want. Features: Product Name: Digital Display Warm Coaster Material: ABS Rated input: DC5V=2A Power supply mode: USB Rated voltage: 5V Rated power: 20W Rated frequency: 50Hz Width: 12cm Cable length: 1.5 meters Material: ABS Length: 150mm Gross weight: 180g Constant temperature: 55¡æ Packing volume: 162x122x22mm Function selling point: 5 levels of temperature adjustment, reminder to drink water, regular heat preservation Product weight: 127g Note: The main performance of this product is heat preservation, not heating. It is better to place hot drinks