firex smoke alarm 120 538b replacement

First Alert Alarm Combo AC/DC with ADP SMICO100-AC: Smoke & Carbon Monoxide Detector, Latching Alarm Indicator, Hardwired

First Alert Alarm Smoke AC/DC with ADP SMI100-AC: Hardwired Smoke Detector, Fire Alarm, Lithium Battery, 10-Year Warranty

First Alert Alarm Combo DC Slim SMCO210 Clam Tray: Smoke & Carbon Monoxide Detector, Fire Alarm, Lithium Battery, White

First Alert Alarm Combo DC RFID SMCO500V Clam Tray: Smoke & Carbon Monoxide Detector, Battery Included, 10-Year Warranty

First Alert 2pk 10-Year Battery Photoelectric Smoke Alarm with Slim Profile

First Alert 9120B-AC BRK, Hardwire Interconnect Smoke Alarm with Battery Backup

First Alert Alarm Combo DC10 with VCE SMCO210V Clam Tray: Smoke & Carbon Monoxide Detector, Fire Alarm, 10-Year Warranty

First Alert Alarm Smoke DC10 SM210 Clam Tray: 10-Year Lithium Ion Battery, Fire Alarm, No Hardwired Installation Required

First Alert Precision Detection Interconnect Hardwired Smoke Alarm with 10-Year Battery Backup

First Alert Alarm Smoke DC10 with VCE SM210V Clam Tray: 10 Year Lithium Ion Battery, No Hardwired Installation Required

First Alert Alarm Smoke DC10 with LGT SM210L Clam Tray: 10 Year Warranty, Lithium Battery, No Hardwired Install Needed

Firstalert SMI100 Battery-Operated Smoke Alarm, Ionization

First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack

First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup

First Alert Alarm Smoke DC10 SM210CO400: 10-Year Smoke & Carbon Monoxide Detector, Battery Operated, White, 2-Pack

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup

First Alert SM100V-AC, Interconnect Hardwire Smoke Alarm with Battery Backup & Voice Alerts, 1-Pack

First Alert® SMICO100 Battery-Operated 2-in-1 Smoke and CO Alarm, Ionization

First Alert® SMI110 Sealed 10-Year-Battery Smoke Alarm

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 3-Pack

First Alert® Standard Battery-Operated Smoke Alarm and CO Alarm Value 2 Pack with Models SMI100 and CO400

First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack

First Alert® SMCO200V Battery-Operated 2-in-1 Smoke and CO Alarm with Voice and Location Alerts

First Alert Alarm Smoke DC SMI100 Clam 2pk Tray: 9-Volt Battery, White, Smoke & Fire Detector, 10-Year Warranty