Westek FLC8BC 100-Watt HomeFinder Flashing Screw-In Light Control, Black On at Dusk, Off at Dawn - incandescent and compact fluorescent bulbs Patented design combines an emergency flasher with a light control Flip light switch twice and unit flashes light for 20 minutes to alert neighbors, police or fire aparatus, to cancel simply flip light switch off Helps emergency vehicles, first time home visitors, even the pizza guy find a home quickly and easily Use indoors or outdoors, 100 Watts Max