How does a car anti-theft alarm work?

Question:
does it work electronically, or does it work on sound waves, can it be operated via a cell phone/land phone, using the other remote key

Answers:

Fear of Driving?

Most factory alarms work off of your door sensors (the same thing that turns on your dome light) and are activated by your key remote. Aftermarket alarms use a motion sensor that is triggered when ever the car moves or is wiggled when someone sits in the car or slams a door. There are some High end systems (onstar, lojack, viper) that are activated by sound (viper)and can report the car's position back to you (onstar) or to the police (lojack). Onstar is standard on most GM cars and Lojack is an aftermarket add on

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Is my lower control arm completely necessary?

Well when a thief disturbs a part of the car it goes on

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