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motion detector

   Also found in: Wikipedia 0.01 sec.
motion detector
A device to detect intrusion within an area to be protected. The device radiates waves (electromagnetic or ultrasonic, at a fixed frequency) that are reflected back to the device. If an intruder moves within the protected space, a change in frequency results which is detected and which activates an alarm.


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The Strobe Security Motion Detector is the latest version, which has an alarm that is activated when there is a breach of security.
If someone tries to enter the outside premises, then this motion detector triggers the home alarm system.
In order to ensure maximum security of the home or office the cameras are equipped with a motion detector.
 
 
 
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