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A wide variety of security alarm sensors and detectors are available for use. 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.
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An example of the security threats facing this industry is the 9/11 terror attacks, which highlighted the desire and ability of enemies to generate considerable harm to the United States.