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 50,000 hours) and low light wane 5730 LED chips, it is non-radiative, power-saving, power saving, explosion-proof, energy-saving and can provide max 1000lumens brightness and 6500k white color temperature.