As an update - this device really works well.
We're having work done in our house (our kitchen remodel) and yesterday the dust from the re-nailing of the subfloor after the old tile was removed set off the new smoke alarms, which was picked up by the FF-ZWAVE5 and in turn set off my rules on Hubitat. The alert on my phone came under a second after the smoke alarms starting blaring, and Alexa announced things also.
Although my wife was not pleased with Alexa saying "Fire! Fire! Run for the hills". I'll have to change that.
