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I have a bell box outside and that's it's... I think there is some sort of speaker in the control panel as well. I have recently changed the battery on the outside bell box as low battery came on the panel display. This is the msg I am seeing... View media item 97663
your siren isn't going to work if the panel and siren are not communicating, its probably the battery.
you have to decide if you can change it it/ have a look or whether you want to get the engineer out, if its not been in long then it maybe covered by any warranty offered by the installer if not then you either do it yourself or get an engineer in.
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