External signalling devices
External acoustic-optical alarms with additional functionalities
An alarm system is a set of devices used to protect a property against intrusion (intrusion alarm system) or fire (fire alarm system).
Most burglary alarm systems use passive infrared motion detectors (PIR) and magnetic sensors (reed switches) placed on windows, doors and garage gates - when a sensor is triggered, it causes an alarm. The system is armed/disarmed by entering a special code set by the user on the keypad.
External acoustic-optical alarms with additional functionalities