Google Nest Protect Smart Smoke and Carbon Monoxide Detector Alarm (Battery) in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com
Google Nest Protect 2nd Gen S3000BWES BATTERY Smoke and Carbon Monoxide Alarm 854448003679 | eBay
Google Nest Protect 2nd Generation (Battery) Smart Smoke/Carbon Monoxide Alarm White S3000BWES - Best Buy
Nest Protect (second generation) review: A new Nest device to Protect what matters most - CNET