BRK Electronics First Alert SCO500B OneLink Wireless Battery Smoke/CO Combo Alarm with Voice (Upgraded to SMCO500V)

First Alert SC9120BFF 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm and Carbon Monoxide Combo Alarm (Upgraded to SMICO100-AC)

Kidde KN-COSM-XTR-B (900-0216) (KN-COSM-XTR-BA) (21008700) Intelligent Alarm, Battery Operated Combination Carbon Monoxide, Fire and Smoke Alarm (Upgraded to 30CUDR-V)

Kidde P3010K-CO (21010071) Worry Free 10 Year Sealed Lithium Battery Operated Combination Smoke and Carbon Monoxide CO Alarm (Upgraded to 30CUD10)

BRK Electronics First Alert Low Profile PR710B 10 Year Sealed Lithium Power Battery Operated Photoelectric Smoke Alarm

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

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

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

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 PR700AB Low Profile 9V Alkaline Battery Operated Photoelectric Smoke Alarm

BRK Electronics First Alert PR700B Low Profile 9V Carbon Zinc Battery Operated Photoelectric Smoke Alarm