Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm
Battery Operated - 21007268
Price as of 2026-06-02. Check Amazon for the current price.
Quick Decision
Price Intelligence
- Budget:$24–$39← You are here
- Mid-range:$39–$78
- Premium:$78+
Is This Right For You?
- •Budget-conscious shoppers — priced below 91% of Carbon Monoxide Detectors
- •Kidde loyalists — the brand spans 155 products in our database
- •First Alert Carbon Monoxide Detector offers a better rating (4.7/5) at a similar or lower price ($24)
- •Kidde Carbon Monoxide Detector — higher rated at 4.8/5 ($24)
📊 Based on data analysis of 53 products in this category.
Mubboo Score: B+
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 53 Carbon Monoxide Detectors available to US consumers · last refreshed 2026-06-02.
How It Compares
This Product Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm | Most Popular Kidde Carbon Monoxide Detector | Best Rated First Alert Carbon Monoxide Detector | Best Value Kidde Carbon Monoxide Detector | |
|---|---|---|---|---|
| Price | $29 | $36 | $23.99 | $23.97 |
| Rating | 4.5/5 | 4.7/5 | 4.7/5 | 4.8/5 |
| Reviews | 325 | 35,752 | 22,830 | 1,338 |
| Mubboo Score | B+ | A+ | A+ | A |
Quick Specs
- Alarm
- Carbon Monoxide Alarm
- Color
- Multi
- Style
- Kidde Nighthawk Battery Operated Carbon Monoxide Alarm
- Material
- Plastic
- Unit Count
- 1.0 Count
- Item Weight
- 9.6 Ounces
- Sensor Type
- Electrochemical
- Manufacturer
- Kidde
What People Say
Synthesized from 40 reviews · 100% verified purchases.
Choose a model with a digital display if you want to see real-time CO levels. Note that the low-battery chirp can be mistaken for a smoke detector, so test early; also remember these need replacement after 10 years.
- Plug-and-Play Installation
- Peace of Mind & Reliable Protection
- Battery Backup for Outages
- Loud Alarm for Safety
- Portable for Travel
- No Digital Display on Basic Units
- Low-Battery Chirp Resembles Smoke Detector
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
- ✦Battery operated (three AAs included) to provide protection during power outages
- ✦Test-reset button tests the unit for proper operation and resets the carbon monoxide alarm
- ✦Forty percent longer life than other CO alarms
- ✦Seven-year end-of-life warning alerts user to replace CO alarm
- ✦Meets the requirements of Underwriters Laboratories (UL)
Source: product listing on Amazon.
About Kidde
- 155 products in our database
- Average rating: 4.6/5 across all products
- Price range: $12.87 – $381.75
- Categories: Carbon Monoxide Detectors, Fire Extinguishers, Smoke Detectors
If not the KN-COB-B-LP Nighthawk Carbon Monoxide Alarm, consider these
Bottom Line
Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm earns Mubboo Score B+. Priced at $29 — a budget-friendly option, below the category average of $64. Rated 4.5/5 from 325+ reviews. Strong buy if: budget-conscious shoppers, kidde loyalists. 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 A+, $36) may fit better.
Frequently Asked Questions
Is the Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm worth buying in 2026?
It earns a Mubboo Score of B+, with a 4.5/5 rating from 325 reviews — better than 34% of Carbon Monoxide Detectors we track.
How much does the Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm cost?
It is currently $29 — budget-tier pricing for Carbon Monoxide Detectors.
How does the KN-COB-B-LP Nighthawk Carbon Monoxide Alarm compare to other Carbon Monoxide Detectors?
The category's most-reviewed alternative is the Kidde Carbon Monoxide Detector (4.7/5, 35,752 reviews, $36). The KN-COB-B-LP Nighthawk Carbon Monoxide Alarm carries a Mubboo Score of B+ vs A+.
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 (2026-06-02) and may change.