Suitable for coffee, tea, milk, hot cocoa or candle wax, built-in gravity sensor switch with indicator light, no manual on/off required, heats your beverages to the ideal temperature (131°F/55°C). Thin-walled, flat-bottomed cups provide optimal heat retention, and cups need to weigh more than 0.8lbs (13oz) to activate the gravity sensor switch. The heating plate is covered with a layer of thermally conductive glass, so there is no need to worry about the safety of occasional spills, and it is easy to clean.