BRK First Alert 9120B/1046836/SMI-100-AC Smoke Detector AC Powered w/battery NEW

New BRK model 9120B/1046836/SMI100-AC smoke alarm with battery back-up. The new part number for the 9120B detector is P/N 1046836, model number SMI100-AC. So the SMI100-AC and 1046836 is what BRK used to call 9120B, these are the same units.