I love BLACKJAX! It is an included feature with some older and current Clifford G4 and G5 alarms. There is not an extra charge to install it but it does need to be turned on to work.
G4 alarms:IG7000, IG8000, IG9000, Concept 400, Concept 600, Millenia, Avant Guard 4, Blackjax(stand alone unit)
G5 alarms:IG750, IG850, Avant Guard 5, Blackjax(stand alone unit)
I sell and install all of the current G5 models.