firex smoke alarm 120 538b replacement

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

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

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

First Alert® SMI100 Battery-Operated Smoke Alarm

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, 6-Pack

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

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

First Alert® SMI100 Battery-Operated Smoke Alarm

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

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

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

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

15.8 in Long-Probe Soil Moisture Meter (1-Pack) – Deep Soil Water Monitor for Pots, Planters & Gardens

First Alert SC5 Hardwire Smart Smoke & Carbon Monoxide Alarm, SMCO600NV-AC, 1-Pack, Hardwired

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

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