OVERVIEW: Stay alert of smoke and carbon monoxide. The Alarm Smoke and CO Listener sends you real-time mobile notifications1 whenever it hears sirens from the nearby existing smoke or CO alarms in your home.

FEATURES: Requires the Ring Alarm or Ring Alarm Pro Security Kit. Sends notifications to your phone and tablet, subscription required, sold separately. Place within 6 inches of existing smoke or CO alarms (for optimal performance, install within 3 inches).2 Optional 24/7 Professional...