dual sensor smoke detectors

First Alert Alarm Smoke DC10 SM210CO400: 10-Year Smoke & Carbon Monoxide Detector, Battery Operated, White, 2-Pack

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup

First Alert Alarm Smoke DC SMI100 Clam 2pk Tray: 9-Volt Battery, White, Smoke & Fire Detector, 10-Year Warranty

First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack

First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack

BRK Voice and Locatio Hard-Wired w/Battery Back-up Photoelectric Smoke Detector 1 pk

First Alert Hard-Wired w/Battery Back-Up Photoelectric Smoke and Carbon Monoxide Detector 1 each

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 3-Pack

First Alert® Standard Battery-Operated Smoke Alarm and CO Alarm Value 2 Pack with Models SMI100 and CO400

BRK SMI105-AC Hard-Wired w/Battery Back-up Ionization Smoke Detector 6 pk

BRK Battery-Powered Photoelectric Smoke Detector 6 pk

First Alert CO605 Plug-in Carbon Monoxide Detector with Battery Backup: 9-Volt Alkaline, No Hardwired Installation Needed

First Alert CO400 Battery Powered Carbon Monoxide Detector: 9-Volt CO Alarm, Silences Unwanted Alarms, 7-Year Warranty

First Alert 2pk CO400CN2 Battery Powered Carbon Monoxide Detector: Best CO Detector, 9-Volt Alkaline Battery Included

First Alert CO710 Carbon Monoxide Detector with Digital Temperature Display: 10-Year Warranty, Lithium Battery, White

Ring Alarm Smoke and CO Listener: Compatible with Android & Apple iOS, Battery-Powered

BRK Hard-Wired w/Battery Back-up Electrochemical Carbon Monoxide Detector

First Alert® CO3-B01D-T Battery-Operated Carbon Monoxide Alarm with Digital Display

First Alert® GC01CN Combo Explosive Gas and Carbon Monoxide Alarm with Digital Display

First Alert® Battery-Powered Carbon Monoxide Alarm with Backlit Digital Display

Ring Alarm Smoke and CO Listener 2pk: Controlled by Smartphone App, Battery Operated