no, no point it worked fine for years till it broke, I did put new batteries in the remote tho
but I doubt anything is trouble free at that age, security systems are expected to work for ever with no tlc. What else has the same?
I'm just saying be cautious. Fire is different. You say your are changing conventional sounders? In that case should be a simple swap. But as with all things your last to work on it. As long as your happy to take on all responsibility for the system, then it seems a simple job...
I know its not the answer your looking for but you do know its you that's responsible when working on fire? Even if your working for a company, ie your bit is wrong and people die its prison?
No movement detector will detect a 'flying brick'
A dualtec needs both technologys to activate not just the mic etc.
If you had a sensor that sensitive it would be going off all the time. That's fine when all its doing is turning a light on, not so much for an intruder alarm.
You need to protect the perimeter as above ie glass break (I hate them) vibration (not advisable on a front high street window, or foil.
Id also politely suggest you don't keep saying 'this is simple / plug and play etc' when talking to the people you want advice from and know more than you or you wouldn't be asking.