Aegislink Smoke And Carbon Monoxide Detector 10-Year Lifespan With Replaceable Battery, Photoelectric Fire Alarm And Electrochemical Co Alarm With Testsilence Button, Sc200, 1-PackAEgISLINK Smoke and carbon Monoxide Detector 10-Year Lifespan with Replaceable Battery, Photoelectric Fire Alarm and Electrochemical cO Alarm with TestSilence Button, Sc2..