Ring Alarm Smoke/CO Listener

Ring Alarm Smoke/CO Listener Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms. This device does not detect fire, smoke or carbon monoxide. For best performance, use with detectors that are 10 years old or less and comply with all applicable standards. Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately). With a Ring Protect subscription (sold separately), manage Ring Alarm Smoke and CO Listener and other Ring products through the Ring app. Battery life 3 years max. Batteries are replaceable