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Automobile Alarms

A motor vehicle's horn, bell, siren or other sounding device that is easily audible at 300 feet.  Some alarms have an automatic shut-off and reset capability that provides for the alarm to sound for not more than four minutes, shut off and then immediately rearm itself.  Other alarms have a backup battery which is an auxiliary power source that trips an alarm device if the main power source is disconnected or if the wires to the alarm device are cut or disconnected.

Alarm Systems

The purpose of an alarm system is to make enough noise that a thief will leave without the vehicle. These alarm systems take many forms:

  • Door sensor - a mechanical switch that activates the alarm device if the door is opened without deactivating the alarm system.

  • Glass sensor - an electronic device that activates the alarm if it detects the sound of breaking glass or metal in contact with glass.

  • Motion sensor - a mechanical switch that activates the alarm device if the vehicle is jacked up or towed.

  • Trunk sensor - a mechanical switch that activates the alarm device if the trunk is opened while the alarm system is armed.

  • Ultrasonic sensor - an electronic device that activates the alarm device if an ultrasonic field is disturbed inside the motor vehicle.

  • Vibration sensor - a mechanical or electrical device that activates the alarm device if any part of the motor vehicle is bumped, causing vibration.