If they're all inter-connected I don't see why you would need more than one. I ended up using an adapter made by Kiddie that senses the 9VDC alarm interconnect and triggers a relay.
Home Automation
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Getting notified is nice.
Getting the FD notified is nicer.
https://www.kidde.com/home-safety/en/us/homesafe-collection/
These are “interconnected” using RF which is now acceptable by code at least it’s when I checked with San Diego Fire Marshall. But YMMV. SD has interconnect (only within each apartment) and dual-power requirement in high-rise dwellings.
If there’s an interconnect dongle for old hardwire-connect detectors, you’d find it on/linked from above link.
They all have a 10 year mandated lifetime anyway. Maybe just replace all now?
Don't know if it fits your needs/setup, but I have one of these and it works with my Kidde smoke detectors (these)
Basically just a widget listens for a standard smoke/CO2 alarm sounds, so it doesn't have to be "in the loop" with your detectors.
That said, my smoke detectors do have the wireless interconnect, so if one goes off, they all go off, so I didn't have to worry about where to put the audio detector, just stuck it next to one of the smoke detectors.
This is a much needed product however I feel the cloud is a issue and dependency for home automation systems. This should have a REST library in order to have localized queries and other notifications \ actions to occur. I use Hubitat and others use Home Assistant to do this today. Somebody in the PLM world needs to know the cloud dependency is not the end all answer. Give me a local API I'll write you a driver!