Ring Ring - Alarm Smoke & CO Listener (2-Pack)

Stay alert of fire and CO hazards with this 2-pack of Ring Alarm smoke and carbon monoxide listeners. They let you receive real-time smartphone notifications on your home’s smoke and CO sirens via a Ring Alarm base station. Place each of these Ring Alarm smoke and carbon monoxide listeners within 3 to 6 inches from an existing detector for precise alarm monitoring.