Equipped with photocell sensor, the light bulbs sensor socket can turn on/off at dusk to dawn basics, turning your standard light fixture into automatic dusk to dawn light. No need to physically turn the light on and off. 3-time setting to choose from- programmable light controller to automatically turn your light fixture "ON" at dusk and "OFF" after 2-hours, 5-hours or 8-hours or at dawn, helps to illuminate the night while avoiding energy wasting. No wiring and programming is needed, just screw your light bulb into the Light socket and screw it to the light fixture, make sure the dawn to dusk sensor faces natural light source, for indoor use or outdoor under shelter. Note: Do not use it with an opaque or frosted glass fixture. Color: Black. Material: Thermoplastic.