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An active ultrasonic motion detector emits ultrasonic sound waves that reflect off objects and bounce back to the original emission point. When a moving object disrupts the waves, the sensor triggers and completes the desired action, whether this is switching on a light or sounding an alarm.

This means the sensor has detected motion in its field of view within the last hour.

Long Duration Settings – In most cases, your motion detector light should only stay on for 20 to 30 seconds after it's triggered. However, you can manipulate the settings so it will stay on longer. For example, many lights come with settings ranging from a few seconds to an hour or more.

The short answer is yes. Motion sensors do work in complete darkness, as none of the motion sensors mentioned above are reliant on using images to detect motion. Instead of images, PIR motion sensors detect changes in the level of received infrared.

Typical motion sensors have a range of up to 80 feet, meaning a single motion sensor probably won't cover a long hallway or an open workspace.

50 to 80 feet Installing motion detectors As motion sensors have a limited range - anywhere from 50 to 80 feet - you'll want to place several around your home, especially in areas where people frequently walk, such as hallways, staircases, living rooms, and bedrooms.

Just so you know Motion sensor lights do have a finite amount of life before they expire. Depending on the brand a motion sensor can be expected to last anywhere's from a few months to several years. The latest LED models have longer bulb life, but it's usually the motion sensor that expires first.

If you've integrated the motion detectors into home security systems including emergency lighting and home security cameras, the motion sensors will trigger these to turn on, or to start recording security footage.

Active ultrasonic sensors and passive infrared sensors are the two most common motion sensor technologies, both of which are known for their accuracy and reliability.

20 to 100 feet Detection ranges are typically 20 to 100 feet, and some motion sensor lights let you customize the distance. The angle of detection usually falls within 180 degrees horizontally, and some models are adjustable.

How far can security cameras detect motion? Generally, security cameras detect motion somewhere in the vicinity of 15 to 25 feet. AlfredCam is able to detect motion up to 32 feet in daylight, and up to 22 feet in night vision mode.