Motion Detection Systems When an intruder enters a room the PIR will pick up the change in temperature and trigger an alarm or security recording. Passive infrared (PIR) detection system are like a memory bank that remember how much infrared energy typically gets focused on its surface when there is no activity in the area. When an intruder enters a room the PIR will pick up the change in temperature and trigger an alarm or security recording. Passive infrared (PIR) detection system are like a memory bank that remember how much infrared energy typically gets focused on its surface when there is no activity in the area. Read more about ---> Motion Detection Systems security camera
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