Blackjax is advertised as an anti-carjack feature. It's not at all like LoJack. It's like this, when you get blackjax, you get a plain view coded valet keypad on which you have to enter ur secret code(up to 4 digits) everytime you get in the car. If you start to drive off w/o entering the code within a certain amount of time(user selectable) then the alarm will chirp to remind you, you then have a few more seconds to enter it or the alarm will shut the car down and you'll be dead in the water, sirens blasting and nothing will stop it. Anytime a door opens and closes while the car is running, you have to enter the code again, that's why it's called "anti carjack" cause if you get jacked, the fag jacking you has got to opent the door at least so he can get in, blackjax won't let him get far, you can walk to recover ur car once it dies cause he doesn't know ur code