Sensors :
Sensors are designed to protect both the perimeter and the open spaces
inside the home. As mentioned earlier, perimeter devices primarily protect
doors and windows. The most common perimeter sensors are magnetic door
switches, window vibration detectors, and window acoustical detectors.
Space protection sensors called motion detectors cover interior rooms and
hallways and can detect an intruder who has been able to defeat a perimeter
device.
Exterior motion detectors and motion-activated security lights are
also used. The following paragraphs describe the types of sensors required in
basic home security and surveillance systems.
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