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Kidde Smoke & Carbon Monoxide Detector, Hardwired Interconnect, Combination Smoke & CO Alarm with Battery Backup, Voice Alerts - Amazon.com
Smoke and Carbon Monoxide Detector Battery Powered Dual Sensor Combination Smoke & CO Alarm with LCD Screen, Led Indicator and Loud Sound Alert, Complies with UL 217 & UL 2034 Standards - Amazon.com
Kidde Hardwired Smoke & Carbon Monoxide Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators, 2 Pack - Amazon.com
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