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Reliability of glass breakage listening devices



The local consumer magazine in Washington DC says of glass breakage
listening devices "A recent study by the Association of Central
Monitoring Stations declared these devices unreliable".

I can't find a date on the article, so I checked the web site of the
Central Station Alarm Association.  I couldn't find anything there
either.  I have had a few local companies come by to assess my home and
almost all have recommended them.

Are they reliable?  Do they give lots of false alarms?  Should I use
them iin my home?

Thanks,

Andrew



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