they told me that the stock alarm on my car has no shock sensors. I was a bit surprised.
why, this is how almost all factory systems are, there are a few dealer add ons for shock sensors, but this is the biggest reason that factory systems are pretty weak.
second, i would take back that old ass battery back up they sold you, if a thief is smart enough to kill the alarm, the standard battery back up wont take them much longer to deal with, (a) most common way of shutting off an alarm is to just cut the siren's wires, the alarm can go off as long as it wants to, if it cant send power to the siren, then its not going to make any noise. (b) if they are really hard core and find the system brain, they can just cut the power supple going to the alarm brain itself and render the battery useless.
the newer DEI 515R model
Amazon.com: Install Essentials 515R Self-Powered Rechargeable 6-Tone Siren: Electronics
actually has the battery built in to the siren, so even if they did cut the wires right at the siren, it will still go off (even if the alarm is not triggered somehow) the only way to shut this off is with a special security key, the only thing that the thief could do is rip off the siren and throw it, which in the middle of the night will still make a hell of a racket.
Best alarm is to keep a pistol nearby to let a possible thief know you mean business.
if you really want a good alarm, you should just get a viper, a real fukcing snake.lol just dont feed it enough and it will take care of any thiefs around (best part is that they cant come back ant try it again later)
I'm going to add the proximity sensor when I have time.
honestly alex, im not a huge fan, they just seem to add too many false alarms. they also have their short comings, object that move slow enough can reach right in and grab stuff with out setting them off, and they are a pain in the@ss to get just right, either not sensitive enough, or it gives the warn away from people just walking by in parking lots. usually the only time i recommend them is for convertibles.