Google Nest Protect 2nd Generation (Battery) Smart Smoke/Carbon Monoxide Alarm White S3000BWES - Best Buy
Kidde Smoke & Carbon Monoxide Detector with Voice Alerts, Battery Powered, Combination Smoke & CO Alarm - Amazon.com
Kidde Worry-Free Combination Smoke and Carbon Monoxide Alarm (Battery Operated)
Smoke Carbon Monoxide Detector, AEGISLINK Interlinked Combination Smoke CO Alarm, Battery Powered, Wireless Interconnected, Digital Display, SC-RF220, 3-Pack - Amazon.com
First Alert PRC710B Low Profile 10 Year Sealed Lithium Battery Operated Photoelectric Smoke and Carbon Monoxide Alarm | Smoke Alert
First Alert Battery-operated Smart Combination Smoke and Carbon Monoxide Detector in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com