Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm, Battery Operated - 21007268
Kidde

Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm, Battery Operated - 21007268

$29$47.89★ 4.5(325 reviews)
Mubboo Score 6.0/10
  • 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)
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Mubboo Value Score: 6.0/10

Quality9.0/10
based on 4.5/5 customer rating
Popularity0.1/10
325 reviews, top 60% in Carbon Monoxide Detectors
Value9.1/10
priced below 91% of Carbon Monoxide Detectors

How it stacks up

Rated 4.5/5 — better than 34% of 53 Carbon Monoxide Detectors we track. Budget-tier pricing at $29.

Head-to-Head vs Category Leader

KiddeKidde (Leader)
Price$29$79.97
Rating4.5/55.0/5
Reviews32517
Mubboo Score6.0/104.0/10

The Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Al is 64% cheaper but rated lower (4.5 vs 5).

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 reviewers 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.

Rating reliability

Moderately reviewed — reasonably reliable

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

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$42.97 ★4.9
Kidde Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Indicators, 85 dB Alarm, 5th Edition, COB10
Kidde Carbon Monoxide Detector, 10-Year Battery Powered, LED Status Indicators, 85 dB Alarm, 5th Edition, COB10
$45.97 ★4.9
Kidde Carbon Monoxide Detector, AA Battery Powered, Portable for Travel or Home, 85 dB Alarm, LED Status Indicators, 3rd Edition
Kidde Carbon Monoxide Detector, AA Battery Powered, Portable for Travel or Home, 85 dB Alarm, LED Status Indicators, 3rd Edition
$23.97 ★4.8
Kidde Carbon Monoxide Detector, AA Battery Powered, Portable for Travel or Home, 85 dB Alarm, LED Status Light Indicators, 5th Edition, COB
Kidde Carbon Monoxide Detector, AA Battery Powered, Portable for Travel or Home, 85 dB Alarm, LED Status Light Indicators, 5th Edition, COB
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Frequently Asked Questions

Is the Kidde Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Alarm, Battery Opera worth buying in 2026?

It earns a Mubboo Score of 6.0/10, with a 4.5/5 rating from 325 reviews — better than 34% of Carbon Monoxide Detectors we track.

How much does the Kidde Kidde KN-COB-B-LP Nighthawk Carbon Monox cost?

It is currently $29 — budget-tier pricing for Carbon Monoxide Detectors.

How does it compare to the top-rated Carbon Monoxide Detectors?

The Kidde KN-COB-B-LP Nighthawk Carbon Monoxide Al is 64% cheaper but rated lower (4.5 vs 5).

Sources & References

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