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Worry Free Smoke & Carbon Monoxide Alarm, With Voice Warning, 10 Year Sealed Lithium-Ion Battery, Photoelectric & Electrochemical Sensing Technology With Smart Hush Feature, Combines The Detection Capabilities Of A Photoelectric Sensor With That Of An Electrochemical Sensor, Used To Detect CO When Either Sensor Notices A Potential Hazard, It Will Communicate With The Other Reducing Nuisance Alarms Increasing The Detection Of Actual Threats.