These electric plug-in fragrance warmers are our newest of our candle-warming devices. The plug-in warmer contains a bulb which illuminates, and melts scented wax quickly. The fragrance is released with no open flame. They are very clean-burning and eliminate indoor air pollution and fire hazard. The ceramic dish at the top of the warmer holds 1 oz. of scented tarts. Our Melter Cube fragrance tarts work great with these warmers. Just plug it into any 120V outlet. The warmer uses a 15 watt bulb.