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Kidde Firex Hardwired Combination Smoke and Carbon Monoxide Detector with Voice Alarm and Front Load Battery Door (2-Pack) 21007624 - The Home Depot
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CO1224T - Honeywell System Sensor Hardwired Conventional 4-Wire 12/24-Volt Carbon Monoxide Detector (w/RealTest Technology)
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First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup | First Alert
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