This wired wall-mount passive infrared (PIR) motion sensor offers exceptional performance and sleek design, delivering dependable security for any space. It detects motion within its coverage area by sensing heat changes caused by intruders passing through the detection zone. When the sensor’s infrared beam is interrupted, it sends a signal to the main control panel, instantly triggering the alarm system to alert you of unauthorized activity. | Spt | | Wired Dual Passive PIR Intruder Alarm Motion Sensor (4-Pack) | Best Buy