I have had an alarm in my Chevy truck for a long time. It went out after about 8 years, so I replaced it a few months ago with a new Viper. There are about $200 installed at best buy. If you have power locks, it will give you key less entry. Also you can not start the truck with out disarming the alarm. You can't just unlock the door with the key. If you do it trips the alarm, and the truck will not start. If you want remote start, it cost a good bit more, but the $200 alarm does have an automatic kill switch. There are a few times in the past, that I know the alarm save me from a brake in. It has gone off a few times when the truck was sitting in the driveway for no reason, except that it had been tripped.