Security systems are great but don't fully rely on it. Faulty wiring and power outages can throw any system off track.
It is a well known fact that a dog w/a good bark can deter any criminal.
If you don't have experience in home security systems, then you probably don't have experience with burglars. Do your research on both and in your area.
They told us in self defense that home invasion criminals have nothing better to do than to scope a home/neighborhood they want to steal from. That is their "job" and they want to do it well. They study who lives where, who has what, resident schedules, cars, routine, even security systems and how to disengage them...and then wait to strike. It is very rare that a criminal will just drive up to some random neighborhood and pick some random house at some random time to break in. Criminals these days are very progressive - they won't make any effort unless they will get a sure return on their efforts.
I am a full believer that if half the women who are attacked knew how to defend themselves, they wouldn't be raped or killed. Same thing w/kids.
Stay safe everyone!