First Alert SMI100-AC, 9120B Replacement Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack RiRe they have 5 different shapes

they have 5 different shapes

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First Alert SMI100-AC, 9120B Replacement Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack RiRe they have 5 different shapesBrand: FIRST ALERT Color: White Features: 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