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7.a - VE736AM a 60m Pir will look smashing in your front rm

Are you in the UK? If you need professional advice you should be getting it from your installer who will be installing it. If you intend to DIY install, the advice you get will not be 'professional' as none of us know your actual requirements, you have merely posted a list of product specifications Is this to replace an existing system? Will be usually dictated by (1.) Will usually be dictated by (1.) Outdated, what do you intend to do with this connection if the system is not professionally monitored? There will usually be a choice of 1 wireless siren per manufacturer, so effectively dictated by (1.) again. I give up on the rest as there is no 'best' technology any more than there is a 'best' car.

CSD Professional - Dial 1993 ish into the time machine-