PIR Motion Sensor Included: High quality PIR infrared sensor is installed at the tip of bulb, so the motion sensor bulb light up automatically while it detects motion within 2-3meters in the dark, and automatically off after the motion ceased or disappeared about 25 secs. NOTE: Make sure the sensor is pointing down within proper distance and angle. To increase the bulb's sensitivity, you can adjust the Angle and Height of the bulb installation, make the sensor toward the direction people Built-in Dusk to Dawn Sensor: This smart bulb automatically switches ON at dusk when the motion sensor is activated and OFF at dawn.NOTE: not turn on in the daytime even when they detect motion. And if you use it for the first time during the day, it turn on for and off when you turn on light switch Energy Saving and Usage Occasion: These security motion sensing bulbs only light up in the detective range at night or in dark environment, energy-saving, environment protecting and , can be use in stairs, hallway, bathroom, front door, storage room, garage, balcony, gate and so on. The higher you hang the bulb, the larger detection range it achieves as the highest could be 3 meters Color: As shown Material: PC Package Contents: 2 * Led Bulbs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.