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• ritahelenacruz

  What kind of indoor security systems are there?

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• chriskreps

  The passive infrared detector is one of the most common detectors found in household and small business environments because it offers affordable and reliable functionality. The term passive means the detector is able to function without the need to generate and radiate its own energy.

• smitnsmit

  Ultrasonic detectors transmit ultrasonic sound waves that are inaudible to humans. There must be motion of an object either towards or away from the receiver. The motion of the object must cause a change in the ultrasonic frequency to the receiver relative to the transmitting frequency. Microwave detectors are another simalr form that uses microwaves to detect energy.

• llburden

  Photoelectric beam systems detect the presence of an intruder by transmitting visible or infra red light beams across an area, where these beams maybe obstructed. The glass break detector may be used for internal perimeter building protection. When glass breaks it generates sound in a wide band of frequencies.