LIGHT SENSOR SOCKETS TURN LIGHTS ON AT DUSK, OFF AT DAWN! Never come home to a dark house again—just insert sensor into any lamp socket, indoors or outside. Built-in photo-electric “eye” senses light automatically; when daylight fades, lamp comes on and when the sun rises, it goes off. Makes home look occupied and deters intruders! Works with standard light bulbs from 60 to 150 watts. UL-listed.