?Gravity induction switch? Easy to use, no need to turn it on/off manually. The product is used for heat preservation and does not have the function of boiling water. ?Night indicator? The Indicator light will be on when mug warmer is working. So you can find your drink without turning on the light at night. ?Use Suitable Mugs? A thin-walled, flat-bottomed mug will have the best warmth retaining performance. ?Safe Durable? FCC UL certificated. The spill-proof design avoids damage and makes cleaning a breeze. ?Best Gift Choice? Beautiful and compact design, easy to take anywhere, it will be your best gift choice on Thanksgiving, Christmas or other special occasions.