#1: A detector is triggered #2: A signal is sent to the Alarm Receiving Centre and the internal #3: The Alarm Receiving Centre immediately telephones your home for password identification and to check everything is in order #4: If the password ID is not given, or the telephone is unanswered the Alarm Receiving Centre contacts a keyholder and/or the police …giving you complete peace of mind that immediate action will be taken to secure your home.