Such alarms may also cause the vehicle's headlights to flash, may notify the car's owner of the incident via a paging system, and may interrupt one or more electrical circuits necessary for the car to start. Car alarms work by emitting high-volume sound (often a vehicle-mounted siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination of these) when the conditions necessary for triggering it are met. JSTOR ( September 2009) ( Learn how and when to remove this template message)Ī car alarm is an electronic device installed in a vehicle in an attempt to discourage theft of the vehicle itself, its contents, or both.Unsourced material may be challenged and removed.
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