First Alert Plug in Carbon Monoxide Alarm | CO606, 9V Battery Backup

Manufacturer statement checked 26 Oct 2026 · source

“First Alert's page for the Plug-In Carbon Monoxide Alarm with Battery Backup, read 2026-10-26. The page is headed CO606 in its title and specification table (it also uses the name CO605 in its body text, and the SKU line reads CO605XP). Specifications table: Sensor Type "Electrochemical"; Power Source "Plug-in"; Battery Backup "Yes"; Backup Battery Size "9V"; Battery Replaceable "Yes"; Sound Level "85dB at 10 feet"; Warranty "7 Years Limited". The page describes a low-battery light and chirp and an end-of-life warning, and does not state a UL standard in its overview or specifications. The user manual linked from that page (M08-0206-008, BRK Brands) prints "UL STD 2034" on its specification label for model CO606, lists "Standards: Underwriters Laboratories Inc. Single and Multiple Station carbon monoxide alarms UL2034", says to replace the alarm 7 years after installation, and says the unit has an end-of-life signal about 7 years after installation. UL's own listing directory was not checked, so UL 2034 is manufacturer-stated here. The manual says the alarm can be plugged directly into a wall outlet located close to the floor, and suggests additional alarms in each separate bedroom and on every level. This plug-in model has no digital display. Amazon title reads "First Alert Plug in Carbon Monoxide Alarm | CO606, 9V Battery Backup".”