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 - Smoke Alarm and Carbon Monoxide Detector - Battery Operated S3000BWES - The Home Depot
Nest Protect (second generation) review: A new Nest device to Protect what matters most - CNET
Review: Nest Protect brings high-tech features to the lowly smoke detector – GeekWire