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Ringing alarm?

At 1.10am every morning for the last two weeks my alarm has starting giving a ringing sound for 20 rings and then stops, whether it is set or not.
Kay, August 2013
spooky!.
I'l take an educated guess and say +[BATTERY]-
that's the backup battery inside the endstation/control panel,that's probably reached the end of it's life.

What's the make/model of the alarm in question?.

e manno, August 2013