Motion Sensor Alarm A motion sensor alarm alerts you by sensing movement in a protected area. Usually with passive infrared, this unseen barrier creates a threshold that, when penetrated, triggers an alarm and lets you know you have an intruder.
Motion Sensor Alarm
A motion sensor alarm alerts you by sensing movement in a protected area. Usually with passive infrared, this unseen barrier creates a threshold that, when penetrated, triggers an alarm and lets you know you have an intruder.
