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  1. All-thumbs-Andy

    Visonic SR740-PH2

    Hi all, first post and although I’m not great at DIY, I’m fairly savvy with IT/radios by trade (Royal Signals) so this one baffles me, all comments appreciated. Two questions relating to Visonic and specifically Powermaster 10 G2 and siren. (1)My external siren bell isn’t self testing or...
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