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Welcome to the First Alert Help Center. Search Search. Search. "" Find answers about a product: Smoke & Carbon Monoxide Alarms · Onelink Smart Home. You have purchased a state-of-the-art Smoke Alarm designed to provide you with early warning of a fire. Key features include: Smart Technology designed to help FIRST ALERT / BRK ALARMS BRK 9120B (OLD# 4120B) 120V AC/DC SMOKE DETECTORLot of 12 - - Amazon.com.First alert sa710b first alert photoelectric smoke alarm, 9 vo battery smoke detectors amazon.com. First alert brk sc 9120b hardwire combination smoke/carbon Learn how to replace the batteries in a smoke or CO detector. chart in this article or your user manual to find the right replacement batteries, typically 9V or AA. Jan 14, 2010 - Products 1 - 50 of 51 -