BRK® Direct Wire Photoelectric Smoke Alarm - 120V AC - 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 #7016TCA

"This product has been discontinued with replacement part available. Please review sku# 112304 as an alternate solution".