First Alert® Plug-In CO Alarm with 9V Battery Back Up

85-decibel alarm sounds when CO levels are elevated

• 9V battery backup allows for constant monitoring during power outages
• Single test/silence button allows for easy operation
• CO detector plugs into any standard electrical socket for a simple set up
• A low-battery light and chirp noise will signal you when the CO detector has reached the end of its life and needs to be replaced