Kidde 10 year Worry Free Carbon Monoxide Alarm will provide you and your family with a loud warning signal against the dangers of elevated carbon monoxide levels in your home. This alarm features a digital read-out that will provide you and your family “at a glance” real-time readings of carbon monoxide levels in your home. No more waking in the middle of the night to the dreaded midnight chirp when you install this Worry Free alarm that is powered by a ten year sealed long-life lithium battery. With this alarm monitoring your home for carbon monoxide you and your family are protected from the dangers of the silent killer, even during power outages.