BRK Electronics First Alert 9120B-48B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm - Saving 48-Pack (Upgraded to SMI100-AC)

BRK Electronics First Alert 9120B-48P 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm - Box 48-Pack (Upgraded to SMI100-AC)

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

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