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Door contacts may be hardwired or wireless; hardwired contacts are usually buried in the doorframe, which is less obvious than wireless and are preferable. Window Contacts: Can be hardwired or wireless. Motion Sensors: It’s the most essential and common form of protection. Passive infrared sensors: Detect motion by sensing a sudden change in heat. 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.

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Perhaps the apex of this tendency on the part of the American people to become privately involved in issues of security was in the era during the Colonial War, when privateering was extremely profitable for a number of westernized nations.

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The trends in collaborating the efforts and partnerships of private security with the DHS are growing, too.