LIYING green porcelain coffee cup heater; heat preservation device 55 degrees heating automatic constant temperature cup ceramic cup 350ML coffee milk smart heater (this product only provides heated c

1)Use a flat-bottom and thin-wall cup with a cover will help warm your beverage in a few minutes. warmer for use with coffee, tea, hot cocoa & more 2)The heater is not suitable for vacuum cup, plastic cup, double glass cup and bagged beverage. Please choose flat bottom cup, box or stainless steel cup for insulation. 3)Easy to clean, wipe the heating plate with paper towel or dry cloth. 4)The heating plate is suitable for cups up to 3.54 inches in diameter. (this product only provides heated coasters,the cup is for reference only) 5)item power is 16W and use for 220V