An intruder alarms system protects your property and family by alerting you when the property is unattended and invaded by thieves or unauthorized persons. Usually an intruder alarm system consists of vibration sensors on windows and magnetic contacts on all exit/entrance doors to detect unauthorized opening. In addition, for large room, a passive infra Red (PIR) motion sensor can be fitted. This is activated or deactivated via a control panel that indicates which zone an intrusion is taking place. The alarm could be silent or audible with a flasher depending on preferences. It comes complete with remote panic switches and a stand by battery to operate the systems in times of power failures.