BRK Electronics First Alert SCO5B 2 AA Batteries Operated Photoelectric Smoke Alarm and Carbon Monoxide Combo Alarm (Upgraded to SMCO210)

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

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

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

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

BRK First Alert SM500V (1046774) Interconnect Battery-Operated Smoke Alarm with Voice Alerts (Upgraded to SMCO500V)

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

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

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

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

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

BRK First Alert SMCO100V-AC (1046781) Interconnect Hardwire Photoelectric Smoke & CO Alarm with Battery Backup & Voice

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

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