The Kidde 900-0280CA (Model: KN-COP-DP-10YLCA) is a 120?V AC powered, plug-in carbon monoxide alarm with sealed lithium battery backup and a digital display. The 900-0280CA is an easy to install unit that provides reliable protection against the dangers of carbon monoxide. The 10-year* sealed battery offers protection during power outages, prevents unwarranted removal of the battery, and eliminates the need for annual battery replacement.