First Alert Plug-In 120V Electrochemical Easy To Read Digital Display Carbon Monoxide Alarm Specialty Electronics Batteries Gallon covers approximately 4

Gallon covers approximately 4

No digging or chopping and safe to use

Use outside on outer surfaces of screens

Zinsser bulls eye 1-2-3

20" id x 2

First Alert Plug-In 120V Electrochemical Easy To Read Digital Display Carbon Monoxide Alarm Specialty Electronics Batteries Gallon covers approximately 4Electrochemical sensor Easy to read backlit digital display allows a quick view of current and peak CO levels. Plugs into any wall outlet and includes a battery back up for detection even during power outages EZ access battery door allows you to change batteries without having to dismount the alarm 5 decibel horn sounds if carbon monoxide levels are too high, and a test silence button silences the alarm and allows you to test its functionality