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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Water Leak Monitoring Sensor with Alarm 6 Pack - Leak Puppy Electronic Water & Flood Leak Detector - Detects as Little as 1/32" of Water - Overflow

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

Water Leak Bug Monitor Sensor with Alarm 6 Pack- Electronic Flood Detector for Home- Detects as Little as 1/32" of Liquid- Overflow Alert Beeps Loudly

Leak Puppy Electronic Water Alarm- Detects as Little as 1/32" of Water- Leak Detector Beeps When Battery is Low

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