The Kidde KN-COP-DP-B AC powered, plug-in carbon monoxide alarm with 2AA battery backup and digital display is an easy to install unit that provides reliable protection against the dangers of carbon monoxide. The 2AA backup batteries offer protection during power outages, and ship in the unit with pull tab activator for quick installation. The Kidde KN-COP-DP-B carbon monoxide alarm has a 10-year limited warranty. 10-Year Life: “If your CO alarm was manufactured prior to 2013, it does not have a 10 year life. Consult your User Guide for additional details, or contact us for more information.” The Kidde KN-COP-DP-B plug-in carbon monoxide alarm with battery backup provides you and your family with a warning signal to protect against dangerous levels of carbon monoxide in your home. The battery backup feature provides continuous monitoring of CO levels, even during power outages when AC-only units are not providing protection. The KN-COB-DP-B alarm has a 10-year product life, providing 40% longer protection than other CO alarms.