firex smoke alarm 120 538b replacement

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

First Alert CO400 Battery Powered Carbon Monoxide Detector: 9-Volt CO Alarm, Silences Unwanted Alarms, 7-Year Warranty

First Alert® SMI100 Battery-Operated Smoke Alarm

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

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

First Alert 3pk Battery CO Alarm: Carbon Monoxide Detector, CO Monitor, Lithium Battery Included, No Hardwired Installation

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

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

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

First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup

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

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

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

BRK Hard-Wired w/Battery Back-up Electrochemical Carbon Monoxide Detector

BRK Voice and Locatio Hard-Wired w/Battery Back-up Photoelectric Smoke Detector 1 pk