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Interesting points raised and thanks. I know this event is unlikely to happen but I was just thinking of the neighbours. I'll call Yale.

Many thanks to all for replies. I think this is making sense. As far as I know the siren is a slave to the control unit so I guess logically, without instruction it won't operate.

doherty1234, Thanks for the reply. I'm new to alarms so what's an SAB? If the control unit was dead then I guess it won't call so I'm concerned that the siren would repeatedly arm, alarm, reset and repeat until the battery dies, which could be a long time. The Yale manual doesn't cover...

I've just installed the 6400 and am curious as to what happens if in the very unlikely event of there being a mains power failure and the control panel backup battery died. I have read the manual and searched the forum so sorry if this has been answered previously. Would the siren...