x2 First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup
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• First Alert's 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 alarms will sound
• Battery backup provides continuous protection during power outages
• Alarm indicator visually identifies the unit that initiated the alarm
• Quick Connect Plug included allows for easy installation with no need to rewire
Units came with new house but immediately changed out for different devices. Used approx 2-3 days.