Come and see our amazing products. The cup warmer is suitable for Metal, enamel, ceramic, glassware, etc. A thin-walled, flat-bottomed mug will have the best warmth retaining performance. he Indicator light will be on when the mug warmer is working. So you can find your drink without turning on the light at night. Pls confirm with us about the packing info, stock color and exact production time before placing your order.