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First Alert Hardwired Talking Photoelectric Smoke and Carbon Monoxide (CO) Detector, 2-Pack | Costco
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Kidde 10-Year Worry Free Smoke & Carbon Monoxide Detector, Lithium Battery Powered with Voice Alarm, 2-Pack 21029621 - The Home Depot
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Knox Safety Plugin Carbon Monoxide Detector, Voice Alert & Display, 10-Year Battery Backup - Walmart.com
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