In article . com,
says...
Thank you Hywel for your comment. Apparently you can hear from
microphones what is happening e.g. If you hear a lot of wrenching and
breaking of windows, then you know to call the police etc.

I see. Though it still seems a bit pointless to me. Wouldn't one of
the systems that's connected to a monitoring company be better?

--
Hywel