My 3 minimum requirements for any security system intended to address notifications for life and death emergencies:
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it works when the power’s off
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it uses cellular communication (not talking regular phones here, probably 400 MHz, which is typical for the security industry. But not wifi or Internet.)
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it has 24/7 professional monitoring authorized in my state to call emergency services but which checks for false alarms first)
I also need a one touch panic button since I can’t use a phone.
(BTW, I have all this now, there are many options available in the marketplace that meet these requirements. ST is a separate system for me. I’m very happy with it, but I use it for convenience, not monitoring life threatening emergencies.)
But that’s just me, security is one of those areas where people have very different “must haves.”