BRK Electronics First Alert ZCOMBO-G Two 1.5V AA Battery Operated Photoelectric Smoke and Carbon Monoxide Combo Alarm (Upgraded to SMCO410)

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

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

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

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

BRK First Alert SMICO110 (1046890) 10-YR Sealed Battery Ionization Smoke & CO Alarm

BRK First Alert SMCO210 (1046802) 10-Year Battery 2-in-1 Smoke & CO Alarm with Slim Profile Design

BRK First Alert SMICO105-AC (1046884) 120V AC/DC Hardwired with Lithium Battery Back Up and Locked Battery Drawer Ionization Smoke Alarm and Carbon Monoxide Combo Alarm

BRK Electronics First Alert PRC700B Low Profile 2 AA Batteries Operated Photoelectric Smoke Alarm and Carbon Monoxide Combo Alarm (Upgraded to SMCO210)

BRK First Alert SMICO100 (1046864) Battery Operated Ionization Smoke Alarm and Carbon Monoxide Combo Alarm

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

BRK First Alert SMCO210V (1046808) 10-Year Battery-Operated 2-in-1 Smoke and CO Alarm with Voice and Location Alerts

BRK First Alert SMCO200 (1046794) Low Profile Batteries Operated Photoelectric Smoke Alarm and Carbon Monoxide Combo Alarm

BRK Electronics First Alert PRC700VB Low Profile 2 AA Batteries Operated Photoelectric Smoke Alarm and Carbon Monoxide Combo Alarm with Voice

BRK First Alert SMCO200V (1046795) Battery-Operated 2-in-1 Smoke Alarm & CO Alarm with Voice Alerts

BRK Electronics First Alert CO250LBT Z-Wave Enabled 9V DC Lithium Battery Operated Tamper Resistant Electrochemical Carbon Monoxide (CO) Alarm