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Dual Tech motion detectors use two different technologies in the same unit: passive infrared and microwave. These devices are designed to avoid false alarms since both technologies must detect motion before setting off the alarm. Photoelectric Sensors: These sensors project a beam of light across a hall or doorway to detect motion and are triggered when a person passing through interrupts the beam. Glass Break Detectors: Usually mounted near windows to detect the specific high frequency sound of glass being shattered. They are usually installed on a wall opposite or adjacent to the protected glass and are effective within about 15′ to 25′. Smoke and Heat Detectors: Detect smoke and heat.

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As Jennifer Elsea notes, “the use of private security contractors PSCs to protect personnel and property in Iraq and Afghanistan has been a subject of debate in the press, in Congress, and…… Private Security Officers Ethical ResponsibilitiesPrivate Security OfficersThe objective of this study is to examine the importance of ethics in security.

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But bear in mind that if danger is detected, professional monitoring services will contact you first if a sensor is triggered.

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