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▪ 120V AC With 9V Battery Backup▪ Photoelectric Smoke Sensor▪ Optipath 360 Technology:Patented Photoelectric Smoke Sensing Design▪ Latching Alarm Indicator: Remembers Which Unit Initiated An Alarm▪ Two Locking Features: Pins Are Provided To Lock Battery Drawer And/Or Alarm To Base▪ Single/Test Silence Button▪ 10-Year Limited Warranty▪ Mfg #7016BTCA