There is a difference between a monitored (aka paid central location 24/7/365 monitoring with a monthly cost), and a system that can notify you of a problem (no central monitoring, and typically no monthly cost). In both cases you are notified of a problem, in the first, the police are also typically notified, in the latter, you take on the responsibility of notification. Also, in the latter case, these systems will typically have a list of phone numbers to call if the first one does not answer.
So you can make a decision as to the type of monitoring you want. There are advantages and disadvantages to each approach.
I hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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