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

BRK Electronics First Alert CO250B6CP 9V DC Battery Operated Tamper Resistant Electrochemical Carbon Monoxide (CO) Alarm - Contractor 6-Pack (Upgraded to CO6B01)

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

BRK Electronics First Alert CO615B 120V AC/DC Plug-in with 2 AA Batteries Backup Electrochemical Carbon Monoxide (CO) Alarm with Digital Display (Upgraded to CO7P01D)

Kidde KN-COU-B Kidde Ultra-Sensitive Battery Powered Carbon Monoxide Monitor

BRK Electronics First Alert CO511B OneLink Wireless Battery CO Alarm with Voice (Upgraded to SMCO500V)

Kidde 21006973 (6pcs bulk) AC Powered, Plug-In Carbon Monoxide Alarm