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500+ siren 'pinging'?

The siren on my Scantronic 500+ alarm system has started to 'ping' every 5 minutes or so. Nothing shows on the panel. What is that all about and how do I stop the pinging?
john moss, September 2015
are you sure its the bell box?no inside units sounding?replace the internal battery of the control panel if its more than 5 years old

gts, September 2015
you replace the sab battery in it

gts, September 2015
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