First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack

First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency, Through early warning interconnect, when one alarm sounds, all compatible, Quick Connect Plug allows for easy installation with no need to rewire, Battery backup provides continuous protection during power outages, Test/silence button for efficient testing to ensure alarm is working properly