PIR Infrared Motion Sensor: Motion Sensor Bulb lights up automatically while detecting motion in the dark with the sensitive PIR infrared chip on the top of bulb and turn off in 45 seconds when not detecting motion., Dusk to Dawn Sensor: To enhance energy efficiency, motion bulb features a built-in dusk to dawn sensor, which also called light sensor or photocell detector. During the daytime or when the ambient light intensity exceeds 30lux, the sensor bulb remains off; Under low-light conditions such as dusk or when the light intensity is below 15lux, the sensor light bulb will automatically turn on when motion is detected., Super Bright & Energy Saving: 13W 1100lm motion sensor bulb is super bright and equivalent to an 100W traditional bulb, light up your indoor or outdoor space easily, with superior LED, it saves up to 85% energy and reduces your electricity costs., Wide Application: You can use this security light bulb in hallway, stairs, basement, closet, storage room, laundry room, bathroom, porch, front door, balcony, back yard, garage, gate and so on, enhance security for you and your families., Warm Tips: Please make sure this motion sensor light bulb is facing down and towards to the required sensing area, the sensor can't be covered by any lighting fixture covers or objects, or else it won't work properly, our motion sensor bulbs come with 3 years warranty, if you have any questions, free contact us through your order on Amazon or send an email to our support team.