Most systems rely on a combination of contacts placed on doors and motion sensors.
The basic elements of a standard security system include:
Control panel: This is where the system wiring terminates, the backup battery is located and where it is connected to the phone lines if it is a monitored system.
Keypad: This is where the system is armed and disarmed.
Siren: To drive away the intruder
Inside motion detector: These sense changes in a room caused by human presence. Special motion detectors are available for people who have pets.
Door and window contacts: This sounds the alarm when the door or window is opened (and the system is on).
A central monitoring station: If the system is monitored, and the alarm is set off, the control panel sends a message to a central monitoring station, which is manned 24 hours a day.
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