To add Smoke/CO Detection to a Smart Home, you can replace or supplement existing sensors with First Alert Z-Wave Smoke/CO Detectors, or even leverage existing smoke detectors by using an Audible Alarm Detector or Insteon Smoke Bridges.
An Audible Alarm Detector does not detect fire, smoke, or carbon monoxide. Instead, it works with existing Smoke/CO Detectors by detecting the sound of their alarm. Note that the effective distance of this kind of audible alarm detection is short. Audible Alarm Sensors should be installed near the Smoke/CO detector they are intended to work with.
The Insteon Smoke Bridge does not sense smoke or CO directly. It works by pairing with an existing First Alert ONELINK device.