Keep Beverages Warm -The cup warmer mainly keep your coffee, water, milk, tea, and other beverages at the perfect temperature for a long time, wherever and whenever, you can enjoy your favorite drinks at the perfect but not-too-hot temperature. Use Suitable Mug -Use a thin-walled, flat-bottomed mug will have the warmth retaining performance Gift Choice -Beautiful and compact design, keep your beverages always warm, It will be your gift choice to show your care to your families, lover or friends on Valentine's day, Thanksgiving, Christmas or other special occasions. Attention 1. please make sure the input power5V 2A, or it can not get enough power and the heating will be slow and weak. 2. we don't recommend use concave and thick bottom cup, the heating will be slow and bad heating result 3. This is the cup warmer only, not the electric kettle, it can not boil the water, heating time has to be 25-35 minutes at least, the max temperature will be 45-60, it depends on the thickness of cup bottom and heating time