TLDR Review: First Alert CO615 Carbon Monoxide Detector
Verdict
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.
- Top pro:
- Simple setup thanks to straightforward instructions and included batteries.
- Top con:
- Green LED indicator is poorly positioned and difficult to see.
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.
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How we researched this
About this review: it summarizes the professional reviews and customer ratings ShopSavvy collected for this product, alongside prices from 3 retailers in ShopSavvy's price data, most recently seen May 28, 2026.
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
| $9.00 | Dec 8, 2024 may have changed | ||
| $39.98 | May 28, 2026 may have changed | ||
| $50.19 | Dec 8, 2024 may have changed |
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