First Alert FCD2DDCN Digital Display Carbon Monoxide Alarm

What a memory! The Peak CO Memory remembers the highest level of carbon monoxide detected. That way, even if the air is clear by the time investigators arrive, they can check how much CO was present during an alarm. Digital Display. Test/Silence Button and Alarm Indicator Lights. 5-Year Limited Warranty on Alarm. Plug-In (Electrical) Powered.