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It is obvious what most sensors do, so we will only describe the main ones used in a basic system. Contact Sensors: Most burglaries involve doors, either on entry or while leaving the house. So protecting all doors is a must. Example: magnetic circuit breakers. 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. 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.

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However, with the decreasing size of surveillance equipment, illegal surveillance can be concealed virtually anywhere.

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Sensors are the most vital part of the system; they act like the eyes and ears of a home alarm system by monitoring break in points and interior areas.

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Some home security companies sell additional equipment at a discounted rate if you’ve purchased their home security system.

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The Ethics of Paying Civilians to Enter Harm's wayThe American military hired private contractors to pull…… Ethical Considerations for the Use of Technology to Meet Selected Homeland Security ObjectivesIntroductionThe Digital Age has transformed the way the world works for better or worse.