Compare Carbon Monoxide Detectors
Updated June 2013
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Features
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Smoke Sensor
Audio Alarm
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Display
Test/silence button
Features
Visual indicators
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Best plug-in carbon monoxide detectorPros: plugs into any standard outlet, can operate on battery backup, extremely loud horn, seven-year limited warrantyCons: cO level is not continuously displayed, flimsy battery cover029054000712First AlertCO615N/A85-decibel horn120V AC with 2 AA battery backup (included)No7-year limited5 to 7 yearsShows CO level, battery level and peak CO levelYesFront access battery compartment, repeats alarm 4 minutes after mute, low battery alert, end-of-life alert (unit needs replacing), power cord for placement further from the outletGreen LED for normal operation, flashing red LED for alarm or low battery -
Battery-operated carbon monoxide detectorPros: easy to install, placement flexibility, runs on two AA batteries, loud hornCons: battery door easily damaged, no CO level display029054000699First AlertCO-400No85-decibel horn2 AA batteriesNo5-year limited5 yearsN/AYesFront access battery compartment, repeats alarm 4 minutes after mute, low battery alert, end-of-life alert (unit needs replacing)Light blinks every minute for normal operation; flashing red LED for alarm or low battery
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Combination carbon monoxide smoke detectorPros: voice warning alarm, loud, runs on three AA batteriesCons: no CO level display, sensitive to cooking smoke, rear-access battery compartment251221511138KiddeKN-COSM-BYes85-decibel horn3 AA batteriesNo5-year limited7 yearsN/AYesVoice verbal warnings for fire, carbon monoxide and low battery; Test/Reset/Hush button, peak CO level memoryFlashing green for normal operation, flashing red for alarm condition
