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Loading... Please wait...The COSM ionization Smoke/CO Detector is U.L. Listed with voice identification accompanied by an 85 decibel alarm. Voice system states "FIRE! FIRE!" when smoke is detected and "WARNING! CARBON MONOXIDE!" when CO is detected. Test/Reset button allows you to test both Smoke and CO sensors. Warning light indicates low battery levels. NOTE: The smoke alarm takes precedence when both smoke and carbon monoxide are present.