First Alert Smoke And Carbon Monoxide Detector Combination Alarms Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

First Alert is the best-performing first alert smoke and carbon monoxide detector combination alarms brand in July 2026, moving 55,000 units across 7 ASINs for 76.4% of Top 10 volume. X-Sense follows with 6,000 units (8.3%), ahead of BRK on 6,000 units (8.3%).

With 4 brands splitting the Top 10 and 93.1% 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 $36.29 to $40.14, 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, 3 ASINs forced its way in: B0CKTZ4GVW booked 8K units at $35.99, with ▲ 300.0% MoM change.

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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.