Google Nest Protect 3-pack (2nd Generation) 3-pack of battery-operated smoke & carbon monoxide detectors at Crutchfield
Google Nest Protect Battery | OnTech
Google Nest Protect Battery Operated Smoke and Carbon Monoxide Detector - White | P.C. Richard & Son
Google Hardwired Smart Combination Smoke and Carbon Monoxide Detector with Voice Alert in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com