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The type of intrusion detection system that places a wire contact across the door or window frame to tell you when the window is open is known as what type of intrusion detection system?
Contact switch
Ultrasonic system
Passive infrared detector PIR
Lightbeam
Electrical circuits are used either with the foil or wire system placed across a door or window frame carrying a low current. When the door is opened or windows opened the circuit is broken and the alarm is triggered.
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