Ecolink FF-ZWave5-ECO Firefighter Z-Wave Plus Wireless Smoke/CO Audio Sensor which works with Alarm.com services.
 
This Z-Wave Smoke Detector Listener sends signals to Z-Wave networks based on existing smoke and CO detectors. Improve your home’s safety system with the Ecolink FireFighter Wireless Audio Detector.
Listens to the alarm sounder of a 120V interconnected or battery powered UL listed smoke or CO detector. Once confirmed as an alarm, the unit sends a signal to your Z-Wave network.