2 PK SEALED First Alert Plug-In Electrochemical Carbon Monoxide Detector

First Alert Plug-In w/Battery Back-up Electrochemical Carbon Monoxide Detector SEALED, NEW Detector alerts you to carbon monoxide Plugs into any standard electrical socket Battery backup allows for continuous monitoring during electrical outages Loud 85-decibel alarm sounds when CO levels are elevated Single test/silence button for simple operation All First Alert alarms are rigorously tested to meet UL standards