After reading the reviews on this product I went ahead and got it installed along with my 3303 Viper Alarm. The reviews informed me of the draw backs to adding this feature to my alarm but like I said I installed it anyway. I just wanted to add to the list of potentially negative consequences involving this alarm, it's also sensitive to anything next to it such as a car, wall or just about anything else. The good thing is, is that after a few minutes it stops "warning" you of a possible threat. Another thing, even though I have tint on my windows that has metal in it, the unit still works well, I would definitely recommend this product to anyone who wants a little peace of mind for when they have a great car and it's out of sight from the owner.