First Alert Plug-In 120V Electrochemical Easy To Read Digital Display Carbon Monoxide Alarm Engine Degreasers Biological activity in septic tanks

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First Alert Plug-In 120V Electrochemical Easy To Read Digital Display Carbon Monoxide Alarm Engine Degreasers Biological activity in septic tanksElectrochemical 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