Because monitoring is pretty much worthless(it will take 15-30 minutes for the police to show up), spend extra money on extra sirens and flashing lights, battery backup, cell phone communication, etc. When mine goes off, all hell breaks loose in noise and lights. It's your basic shock & awe, scare the living **** out of them deal. Also, DO NOT rely on just one system. Have backups. I personally have hidden motion sensor backups that call ME and let me listen in.