Google Nest Protect 2nd Generation Smart Smoke/Carbon Monoxide Wired Alarm, Hardwired Smoke And Carbon Monoxide Detector - Lifespan May Vary

Kidde Hardwired Carbon Monoxide Detector With 9-Volt Battery Backup, Digital LED Display 5.75 Diameter X 1.8 Depth

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Kidde Hardwired Smoke & Carbon Monoxide Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable LED Warning Light Indicators, 4 Pack

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Kidde Hardwired Smoke & Carbon Monoxide Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable LED Warning Light Indicators

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