Google Nest Protect - Smoke Alarm and Carbon Monoxide Detector - Battery Operated - 4 Pack VB4T2B2018 - The Home Depot
Wink | Nest Protect Smoke and CO Alarm
First Alert 10-Year Battery-Operated Smart Combination Smoke and Carbon Monoxide Detector with Voice Alert in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com
Ring Alarm Smoke & Carbon Monoxide Alerts | First Alert Z-Wave Smoke/CO Alarm | Ring
How to Choose the Best Smart Smoke and CO Detector for Your Home | Vivint