First Alert Carbon Monoxide Detector
No Outlet Required, Battery Operated, CO400, White, 2 Count (Pack of 1)
Price as of 2026-08-11. Check Amazon for the current price.
Quick Decision
Is This Right For You?
- •Buyers who prioritize quality over price in Carbon Monoxide Detectors
- •Risk-averse buyers — 22,922+ reviews give a highly reliable picture
- •First Alert Carbon Monoxide Detector offers a better rating (4.7/5) at a similar or lower price ($24)
- •First Alert Carbon Monoxide Detector — 31% cheaper at $24 (Score A+)
- •Kidde Carbon Monoxide Detector — higher rated at 4.7/5 ($44)
📊 Based on data analysis of 6 products in this category.
Mubboo Score: A-
How we calculate the Mubboo Score
Quality (45%): customer rating, normalized to a 10-point scale
Popularity (35%): review volume vs the category leader, log-scaled
Value (20%): price position vs other Carbon Monoxide Detectors
Computed from live Amazon rating, review count, and price across 6 Carbon Monoxide Detectors available to US consumers · last refreshed 2026-08-11.
How It Compares
This Product First Alert Carbon Monoxide Detector | Most Popular Kidde Carbon Monoxide Detector | Best Rated First Alert Carbon Monoxide Detector | Best Value Kidde Carbon Monoxide Detector | |
|---|---|---|---|---|
| Price | $34.99 | $43.97 | $23.99 | $26.35 |
| Rating | 4.6/5 | 4.7/5 | 4.7/5 | 4.7/5 |
| Reviews | 22,922 | 27,202 | 22,830 | 19,737 |
| Mubboo Score | A- | B+ | A+ | A+ |
Quick Specs
- Alarm
- Audible, Visual
- Color
- White
- Style
- Battery Powered
- Unit Count
- 2.0 Count
- Item Weight
- 0.8 Pounds
- Sensor Type
- Electrochemical
- Manufacturer
- First Alert
- Model Number
- CO400
What buyers say about Carbon Monoxide Detectors
Themes from buyer reviews across this category — not review data for this specific model.
Be aware that the low-battery chirp mimics a smoke detector, so check this unit first when you hear chirping. If replacing an older model, note that mounting holes may not align with existing screws.
- Extremely easy installation and setup
- Reliable performance and peace of mind
- Loud and effective alarm
- Battery backup for power outages
- Low-battery chirp mimics smoke detector chirp
- Mounting holes may not align with older model screws
Expert Picks in Carbon Monoxide Detectors
- Kidde Smart Smoke + Carbon Monoxide Alarm — Best smart smoke alarm
- First Alert SC5 Hardwire Smart Smoke and CO Alarm — Works with Nest Protect units
- Kidde Ring Smart Smoke + Carbon Monoxide Alarm — Ring alarm users
Category recommendations from independent expert publications. Source links in References.
Related Video Reviews
- 📹 What Most Homeowners Don’t Know About Carbon Monoxide Detectors — The DIY HVAC Guy
- 📹 Best Carbon Monoxide Detectors in 2026 — wiredtech
- 📹 7 Best Carbon Monoxide Detector 2026! Tested & Tried — Everything Under Control
Key Features
- ✦Keep your family safe with this 2-pack of easy to use, battery operated carbon monoxide alarms; Battery powered alarms provide continuous monitoring of CO levels, even if there's a…
- ✦Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room
- ✦A loud 85-decibel alarm sounds when CO levels reach dangerous levels
- ✦To ensure complete protection make sure to place one on each level of your home and in each bedroom
- ✦5-year limited warranty; Equipped with end-of-life signal chirp, so you know when it’s time to replace the unit for safety
Source: product listing on Amazon.
About First Alert
- 10 products in our database
- Average rating: 4.7/5 across all products
- Price range: $11.98 – $42.98
- Categories: Carbon Monoxide Detectors, Fire Extinguishers, Smoke Detectors
If not the Carbon Monoxide Detector, consider these
Featured in Our Reviews
Bottom Line
First Alert Carbon Monoxide Detector earns Mubboo Score A-. Priced at $35 — a premium option, below the category average of $38. Rated 4.6/5 from 22,922+ reviews. Strong buy if: buyers who prioritize quality over price in carbon monoxide detectors, risk-averse buyers. Skip if: first alert carbon monoxide detector offers a better rating (4.7/5) at a similar or lower price — Kidde Carbon Monoxide Detector (Score B+, $44) may fit better.
Frequently Asked Questions
Is the First Alert Carbon Monoxide Detector worth buying in 2026?
It earns a Mubboo Score of A-, with a 4.6/5 rating from 22,922 reviews — better than 33% of Carbon Monoxide Detectors we track.
How much does the First Alert Carbon Monoxide Detector cost?
It is currently $34.99 — premium-tier pricing for Carbon Monoxide Detectors.
How does the Carbon Monoxide Detector compare to other Carbon Monoxide Detectors?
The category's most-reviewed alternative is the Kidde Carbon Monoxide Detector (4.7/5, 27,202 reviews, $43.97). The Carbon Monoxide Detector carries a Mubboo Score of A- vs B+.
Sources & References
Products available through US retailers. Prices in USD. Sales tax varies by state and is not included.
Mubboo may earn a commission on purchases made through affiliate links. This does not affect our Mubboo Score, product rankings, or editorial judgments. Prices are accurate as of the last sync (2026-08-11) and may change.