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Intruder alarms and fire alarms are electronic alarms designed to alert the user to a specific danger.
Sensors are connected to a control unit via low-voltage wiring or a narrowband RF signal which is used to interact with a response device. The most common security sensors are used to indicate the opening of a door or window or detect motion via passive infrared (PIR).
New construction systems are predominately hardwired for economy. Retrofit installations often use wireless systems for a faster, more economical installation.
Some systems serve a single purpose of burglar or fire protection. Systems range from small, self-contained noisemakers, to complicated, multi-zoned systems.
Access control system is a system which enables an authority to control access to areas and resources in a given physical facility or computer-based information system. An access control system, within the field of physical security, is generally seen as the second layer in the security of a physical structure.
Closed-circuit television (CCTV) is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors.
Intercom (intercommunication device), talkback or door phone is a stand-alone electronic communications system intended for limited or private dialogue. Intercoms can be portable but are generally mounted permanently in buildings and vehicles.