1.Temperature Settings: Our electric mug warmer can slow down the cooling speed of hot beverage; You can choose the temperature by touching the “Tempering Button” keeps the liquid temperature to 104℉/40℃ or 131℉/55℃ or 149℉/65℃. 2.Use Suitable Mugs: use a thin-walled, flat, or slightly concave-bottomed mug for the best results. This coffee cup warmer is suitable for tableware, stainless steel cup, mug, milk box, glass cups and etc. 3.Safe & Durable: With high-tech materials make the coffee warmer heat-resistant and fire-resistant. The spill-proof design avoids damage and makes cleaning a breeze. 4.Safe & Durable: The spill-proof design avoids damage and makes cleaning a breeze. 5.Best Gift Choice: Beautiful and compact design, keep the beverages warm all day long, it's a great gift for lover, dad, mom, wife, husband, and all your loved ones on Valentine's Day, Thanksgiving and Christmas, and other special occasions to show you care.