low voltage detector

First Alert CO710 Carbon Monoxide Detector with Digital Temperature Display: 10-Year Warranty, Lithium Battery, White

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

First Alert® GC01CN Combo Explosive Gas and Carbon Monoxide Alarm with Digital Display

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

First Alert® Battery-Powered Carbon Monoxide Alarm with Backlit Digital Display

First Alert 2pk CO400CN2 Battery Powered Carbon Monoxide Detector: Best CO Detector, 9-Volt Alkaline Battery Included

BRK Battery-Powered Electrochemical Carbon Monoxide Detector

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

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 SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 6-Pack

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