First Alert Sc9120b Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

First Alert is the best-performing first alert sc9120b brand in July 2026, moving 55,000 units across 8 ASINs for 84.6% of Top 10 volume. BRK follows with 10,000 units (15.4%).

With 2 brands splitting the Top 10 and 100.0% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $29.28 to $44.30, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B07G95Z38H booked 3K units at $61.77, with ▲ 0.0% MoM change. On the growth side, B0D9GYH1KJ leads positive momentum with ▲ 900.0% MoM growth on 500 units, with B0CLVRM95Q close behind at ▲ 300.0% MoM on 2K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.