Far Infrared Electric Charcoal Features: This electric charcoal is embedded in the ceramic with a special technology, so you can use it safely without worrying about the wires being disconnected. You can burn incense on the electric charcoal surface. Silver leaves are sold separately. Far infrared radiation electric charcoal, so it is more efficient than ordinary electric heating appliances and can be used economically. There is no risk of electric shock, as the heating element is not exposed. You can also use the ceramic ashtray (sold separately). We do not use cotton for the insulation of this electric charcoal.