According to Edmond Security Inc.'s website, the control panel is the central brain of a security system. The control panel receives signals sent to it from sensors, and it will sound a siren in the event of an alarm condition. The control panel also contains a backup battery.
The keypad is used to arm and disarm your system and to call for an ambulance or police if your system is enabled to do so. The keypad also notifies you of an alarm condition or a problem with your system.
Each exterior door and window should have a sensor. When your system is armed, opening a door or window will cause the system to alarm.
Typical security systems incorporate one or more motion detectors. Motion detectors are active only when a system is placed in the "away" mode, and they provide extra protection in the event an intruder enters your home without setting off an entry sensor.
Companies such as ADT and Brinks will monitor your security system for a monthly fee. Monitored systems provide greatly enhanced protection. In the event of an intrusion, fire, medical emergency or hostage situation, the company will call the appropriate authorities.