Along with door and window sensors, motion detectors are essential home security system components. 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:
- Driveway alarms
- Motion-activated lights
- Motion sensor cameras, including doorbell cameras and floodlight cameras
- Indoor motion detectors, including pet-immune motion sensors
- Floating motion sensors for pool safety
- Some medical alert systems
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.