Along with door and window sensors, motion detectors are home security system essentials. While door and window sensors notify you if someone actively enters your home, motion sensors will alert you if someone is prowling in or around your home. Though there are a few different types of motion detectors, most rely on similar technologies to detect intruders: they pick up on tiny changes—in things like temperature, vibration, or radiation—in the spaces they cover.
Several types of security devices use motion sensors. Some of the most popular forms include driveway motion detectors, motion activated flood lights, exterior motion detector cameras, and indoor motion detectors. You can use motion sensors to automatically turn on a light when someone approaches your home, sound an alarm when movement is detected in your living room, or trigger a motion sensor camera to start recording when someone enters your home.