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• Wide variety of types available. Selection will depend on what you want to accomplish. Some feel a loud alarm at the point of entry will scare away the intruder. Others prefer a remote alarm located in a bedroom that will alert only the homeowner. Others prefer an outside alarm that will alert neighbors. Other kinds will sound an alarm and are connected directly to monitoring systems that will alert the police.
• Simple alarms may consist of a door-locking device with a buzzer attached. When the device is tampered with or the door opened, the alarm sounds.
• Many intrusion alarms are more elaborate and have twocomponents. A perimeter alarm detects intrusion at points of entry, such as door and windows. An area alarm detects motion inside a room.