Car alarm attempt to discourage theft of car

Car alarmby: Michael SanfordA car alarm is a device installed in a car in an attempt to discourage theft of that car. Most alarms work by making a loud sound. Other 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 disturbedCar alarms are set off by vibrations, tilting of the car (to prevent unauthorized towing), or touching