420ml ceramic mug, constant temperature heater coaster

【Easy to Use】Simply place the mug on the heating coaster and plug in the power supply. The automatic temperature control function keeps your drinks at the ideal warm temperature. This thermostatic coaster fits all kinds of modern home scenarios, perfect for warming coffee, milk, water and other beverages. It boasts a compact and delicate look to fully meet your daily heat preservation demands. 【Coaster Compatibility Tips】Compatible with cups of various sizes. Make sure the whole cup bottom fully touches the heating surface. Plastic cups and double-wall vacuum cups are not applicable. It matches flat-bottom ceramic cups, glass cups, paper cups, stainless steel mugs and baby bottles.