Kidde Firex Smoke & Carbon Monoxide Detector, Hardwired with nine-V Battery Backup & Voice Alarm, 3-Pack 21029901 - The Home Depot
Gentex 918-0021-002, Model: GN-503FF is a 120VAC/9VDC single or multiple station combination photoelectric smoke/electrochemical carbon monoxide alarm with tandem interconnect capabilities and dual, independent relays that activate independently for smo
Kidde 120V AC Carbon Monoxide Detectors with Battery Back Up
BRK CO5120BN 120V CO Detector w/Battery Backup
Kidde Hardwired Interconnectable Smoke and Carbon Monoxide Detector with AA Battery Backup and Voice Alerts 21032082 - The Home Depot
First Alert 7030BSL Hardwired Smoke & CO Alarm with LED Strobe Light (1038870)
First Alert Hardwired 120V Electrochemical/Ionization Carbon Monoxide and Smoke Alarm - Carr Hardware