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Siterlink Hardwired Interconnected Smoke Detector Carbon Monoxide Detector Combo, 2 in 1 Smoke and CO Detector with 2 AA Batteries Back Up, AC Smoke and CO Alarm, Voice Alert, Self-Check, 6 Pack - Amazon.com
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AEGISLINK Wi-Fi Combination Smoke and Carbon Monoxide Detector with LCD Display & Replaceable Battery, Compatible with TuyaSmart & Smart Life App, SC-WF240 - Amazon.com
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