We have an ADT system, with the window break alert, motion detection, and carbon monoxide detection. The system was "free" to install, but with upgrades, the total was around $1400, not exactly free. Out monitoring is $52 a month. I know, way too much! I know it I cal, the police, or it it does, it will be about 20 minutes before a car arrives, unless one is close by when the call comes in. It is mainly to alert the neighbors who live about 1/4 mile down the road. They know if the alarm goes off for more than a minute to call me and check to see if everything is ok, and to call the police. Unless he is the one to break in.......