Karr Security Systems

I was hoodwinked to buy this as part of the DEALER new car buying. Not sure whether this is useful but it is super expensive at 800 dollars…

Got a new car that had the Karr security system already installed. I said yes to activating the system because of having had a car stolen in the past, that when found I had an alarm system installed and was glad that I did. And I would rather let the dealership handle it just in case something goes wrong. BUT …
This system, the Karr System, is über expensive, and is truly a dealer installed, i.e., huge markup, item in the car. The manual is a tiny paper fold out that after reading it many times, and after having the stupid alarm go off when I opened my door WITH MY KEY FOB I am getting a better idea of how the alarm works, or doesn’t work.
Talked with a Karr technician and called the company and got completely different stories on how this alarm system immobilizes the car. What it does do is override the immobilizer that came with the car so that when the Karr alarm goes off, the car won’t start.
I don’t regret having an alarm system, and this one may be useful given its ability to ‘communicate’ intrusions to my car, but I would suggest researching other ways to add aftermarket alarms that are probably significantly less expensive and offer better manuals and tutorials.