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First Alert Dual-Power Carbon Monoxide Detector Alarm | Plug-In with Battery Backup and Digital Display, CO615

TLDR Review: First Alert CO615 Carbon Monoxide Detector

By ShopSavvy Team

Published: April 4th, 2025

Pros

•Simple setup thanks to straightforward instructions and included batteries.
•Provides a sense of safety, especially during the winter season.
•The unit offers effective CO detection with a functional digital display.
•Battery backup compartment is conveniently accessible from the front.
•The digital display differentiates it from other alarms by clearly indicating the source of alerts.
•Allows for versatile placement in various rooms, enhancing safety coverage.
•Received positive ratings for performance from Consumers Report.

Cons

•Green LED indicator is poorly positioned and difficult to see.
•Display does not remain lit continuously, only lighting up for tests or alarms.
•Fails to alert users to CO levels below 30ppm, which some may find insufficient.
•Unnecessary nightly alarm with no clear explanation provided in the instructions.
•Reports of previous models having similar reliability issues.
•Some users experienced the unit failing to detect CO in multiple testing scenarios.
•The advertised lifespan of 7 years may not always be accurate according to some reviews.

Bottom Line

The First Alert CO615 Dual-Power Carbon Monoxide Detector Alarm offers convenience with easy setup, battery backup, and versatile placement options. However, its performance is mixed, with some users experiencing reliability issues and unnecessary alarms. While praised for its functionality in many cases, potential buyers should weigh the pros and cons and consider having multiple units for comprehensive home safety coverage.

Lowest at any Popular Retailer

$30.08 at Amazon

How we researched this

About this review: We pulled together findings from professional reviews and hundreds of user reviews, and cross-referenced them with ShopSavvy's pricing data from 16 retailers to give you the short version.