First time I installed a car alarm and it wasnt easy. But after some pain and suffering, I got a great alarm in my car now. The range on it is way better than I thought and it doesnt even have an antenna, I mean I can be so far away that I can barley hear it chirp. If you just want a one way alarm, dont spend anything more get this one. The only bad thing I can say about it is the siren sound is a lil old school, but its the easiest thing to replace if you want a diff one but I really could care less, its loud and tells people to f off. I was about to spend a hundred on the viper 3002 but glad I didnt.