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X-Sense 2-in-1 Smoke and Carbon Monoxide Detector Alarm (Not Hardwired), 10-Year Battery-Operated Dual Sensor Fire & CO Alarm, Compliant with UL 217 & UL 2034 Standards, SC06 - Amazon.com
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Kidde 21007624 AC Photoelectric Smoke and Carbon Monoxide Detector Alarm | Hardwired with Battery Backup | Model # KN-COPE-IC - Photoelectric Smoke Detector Carbon Monoxide Hardwired - Amazon.com