Motion Sensors & Alarms are electronic security devices that detect unauthorized movement or entry and trigger a warning signal. Sensors use passive infrared (PIR), microwave, or dual-technology to detect body heat or movement within a defined area. Alarms include local sirens, strobes, or systems connected to a monitoring service. They are essential for perimeter security, intrusion detection, and automation (like lighting). Placement and calibration are critical to avoid false alarms from pets or environmental factors. Effective systems integrate sensors with a central control panel and often include battery backup for power outages.

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