BRK Hard-Wired w/Battery Back-Up Ionization Smoke and Carbon Monoxide Detector 6 pk

First Alert BRK SMICO100-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup. BRK's Precision Detection advanced sensing technology reduces cooking nuisance alarms and delivers early warning. Smart Interconnect, interconnects with most First Alert and BRK hardwired alarms. When one alarm sounds, all compatible alarms sound (up to 12 smoke alarms and 6 other CO/heat alarms).