Kidde 21006462 KN-COB-DP2 (6pcs bulk) AC Powered, Plug-In with Battery Backup Electrochemical Sensor Carbon Monoxide Alarm

BRK Electronics First Alert CO600B 120V AC Plug-in Electrochemical Carbon Monoxide (CO) Alarm

BRK Electronics First Alert CO605B 120V AC/DC Plug-in with 2 AA Batteries Backup Electrochemical Carbon Monoxide (CO) Alarm

Kidde 21006974 (6pcs KN-COSM-BA bulk) Battery Operated Combination Carbon Monoxide & Smoke Alarm (Upgraded to 30CUDR-V)

BRK Electronics First Alert CO710 DC 10-Year Sealed Lithium Battery Powered Carbon Monoxide Alarm with Digital Display

BRK Electronics First Alert GCO1B 120V AC Plug-in Explosive Gas/CO Combo Alarm

BRK Electronics First Alert CO250LB 9V DC Lithium Battery Operated Tamper Resistant Electrochemical Carbon Monoxide (CO) Alarm

BRK Electronics First Alert CO250B6CP 9V DC Battery Operated Tamper Resistant Electrochemical Carbon Monoxide (CO) Alarm - Contractor 6-Pack

BRK First Alert SMCO110LED-AC (1046789) Hardwired Combo Smoke & CO Alarm with LED Strobe &10-Yr Battery Backup

BRK Electronics First Alert CO615B 120V AC/DC Plug-in with 2 AA Batteries Backup Electrochemical Carbon Monoxide (CO) Alarm with Digital Display

BRK Electronics First Alert SCO500 OneLink Wireless Battery Smoke/CO Combo Alarm with Voice (Upgraded to SMCO500V)

BRK First Alert SMICO100-AC (1046871) 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm and Carbon Monoxide Combo Alarm

BRK First Alert SMCO110V-AC (1046791) 120V AC/DC Smoke and Carbon Monoxode Combo Alarm with 10-Year Sealed Lithium Battery Backup and Voice

Kidde 21025788 (6pcs bulk) Battery Operated Carbon Monoxide Alarm

Kidde 21006249 (6pcs bulk) Battery Operated Carbon Monoxide Alarm (Replaced by 21025788)

BRK Electronics First Alert 83RI 9V DC Battery Operated Ionization Smoke Alarm (Upgraded to SMI100)