Compare Quick view Kidde Kidde AC Powered, Plug-In Carbon Monoxide Alarm - KN-COPP-3 MSRP: Now: $49.99 Was: The Kidde KN-COPP-3 AC powered, plug-in carbon monoxide alarm utilizes sophisticated electronic components and unmatched sensor technology to protect you and your family from the dangers of CO. The KN-COPP-3 includes a 9V battery backup that provides... MSRP: Now: $49.99 Was: Compare Quick view