Two years ago I caught someone trying to steal my car. They were doing it in a way that would not set off my alarm. That prompted me to do a bunch of research about the current state of the art of auto security. Much to my chagrin, most of the items on the market right now are easily defeated by car thieves. There was only one product that everyone said worked. Called a Ravelco device, it consists of a multi-pronged plug and socket that disables multiple electrical systems in your car. They claim that in 29 years and in an installed base of 3 million cars, not one of those cars has ever been stolen.
So I got it. They sent a technician to my house to do the install and he did an excellent job. The solution is simple and elegant. It is not an alarm but a device that makes your car undriveable. It uses a coded dongle and the installer will pick multiple systems (electrical, fuel) that are disabled when the dongle is removed so even if the starter is hotwired, the car cannot run without the dongle. The installer will also go to great pains to disguise where wiring has been spliced. My experience with other mass-installed alarm systems is that they use bright red wire for power and always put the controller and the siren in the same spot.
I have used the Ravelco for several years now. It is completely foolproof and couldn’t be simpler to operate. When you pull the dongle, the car stops and cannot be restarted, period. No false alarms, no waking the neighbors. I feel confident parking my car almost anywhere. They give you two dongles up front and you get a code to order new ones from the company if you should lose one. That being said, we have had some exciting moments when my wife temporarily misplaced her dongle once.
Then two weeks ago I accidentally left my car door open overnight. When I opened the car door to go to work I realized my mistake. Someone had been in my car and had opened my fuse box to look for the alarm shutoff. They had also opened my hood to start the car. The Ravelco had completely foiled them. I love it!