A car alarm is a device installed in a car in an attempt to discourage theft of that car. Most car alarms work by making a loud sound. Other car alarms disable the ignition of the car or send a signal to the owner (by way of a beeper) that his or her car is being disturbed.
Car alarms are set off by vibrations tilting of the car (to prevent unauthorized towing) or touching the car .the vast majority of car alarms which sound are accidental. They are caused by the passing of large trucks the vibration of thunder or people touching the car.
Since most car alarms are accidental people have become numbed to the sound of alarms and do noting to prevent theft because of the large number of false alarms with car alarms many vehicle manufacturers no longer factory fit alarms offering silent but effective immobilizers instead.
As an after market fitting a vehicle tracking system which allows the police to trace stolen vehicles is considerably more effective some car security system incorporate alarms remote car starters keyless entry systems and immobilizers.
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