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. 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). Optional 24/7 Professional Monitoring with Ring Protect Pro subscription, sold separately. Smoke and carbon monoxide monitoring is not available at a business or commercially zoned address.
