I purchased a couple of these $30 First Alert ZCOMBO Fire / CO Alarms. I was able to include with z-stick but not much happening in HG. Today I played around held the test button down while trying to get manufacturer and now it found device, shows alarm and picture of the device from pepper.
The alarm never shows in HG though. Tried using as security sensor and it doesn't trigger alarm.
It is node9 in attached log.