This cup warmer adopts flat ceramic design and is suitable for flat tableware, stainless steel cups, mugs, milk boxes, thin bottomed cups, etc. Therefore, we recommend using steel flat bottomed and thin bottomed cups instead of deep concave bottomed cups. Under the working condition, the hot water will be reduced to warm water, and the cold water will be heated to keep the constant temperature of 55 without cooling, so as to start the warm life. This innovative cup warmer is equipped with clear digital display and touch buttons. At the same time, the 4.5x4.5 small size can be put into the backpack or shoulder bag anytime and anywhere, which is very portable When working, only the tempered glass area is hot, and the round skin will not be hot. It is suitable for heating and insulation of containers made of ceramics, glass, stainless steel and other materials. Please use flat bottomed non double layered cups with this product to avoid affecting the effect. The slim and fashionable design keeps drinks warm all day long. This will be the perfect gift to show your concern for birthdays, Thanksgiving, Christmas and other special occasions. Package list: 1 cup warmer (the package does not contain cups) Due to the difference of different monitors, the pictures may not reflect the actual color of the product. Due to manual measurement, please allow minor dimensional errors.