Night Sense® is a plug & play light sensor adapter for any standard B22 light bulb — not a motion sensor.It intelligently detects ambient light and turns your bulb ON at night and OFF during the day, with no need for timers, apps, or human interaction. Installation is quick and simple — just plug your light bulb into Night Sense®, insert into an existing holder, and bend the flexible sensor arm toward a light source like sunlight or another light source.