Adopts high-sensitive PIR infrared sensor with 120° detection angle at the tip of bulb, no matter you install it in stairs, hallway, bathroom, front door, storage room, garage, closet, balcony, gate or any other places, our motion activated LED light bulb will detect motion within 20ft in the dusk. Also, integrated with light sensor, it features dusk to dawn auto on/off function (automatically turn on at night and turn off in daytime). Additionally, Built-in high-efficiency, long lifespan (over