Its vibration activated and theres an adjustment switch so you could have it go off if your jeep is touched, the door is opened, or if someone sits in it. I've had it for a few weeks and so far it still scares the sh*t out of me when i forget to turn it off
I think upgrading the speakers would be fine as long as it's not a speaker box or something visable . . . the head unit is what usually gets stolen . . . that and the change in the tray and whatever else they can grab.
Bite the hand that feeds you . . . you've had more than enough to eat already.