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Kidde Nighthawk KN-COB-B-LP Battery Carbon Monoxide Alarm with Digital Display
$26.99
Final price set by Amazon · may vary
EDITORIAL REVIEW — Kidde Nighthawk KN-COB-B-LP Battery Carbon Monoxide Alarm with Digital Display Assessed on the standards the product is actually certified to and on how the format fits a working shift, by Steven E...
Key Features
- Nighthawk brand CO detection by Kidde
- Battery powered — no outlet required
- 85 dB alarm with visual alert
- Test/reset button
- Wall-mount or tabletop installation
- UL 2034 listed
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EDITORIAL REVIEW — Kidde Nighthawk KN-COB-B-LP Battery Carbon Monoxide Alarm with Digital Display
Assessed on the standards the product is actually certified to and on how the format fits a working shift, by Steven Eaton, WC Safety editor.
kidde nighthawk kn-cob-b-lp battery carbon monoxide alarm — what the listing actually specifies
Kidde Nighthawk KN-COB-B-LP Battery CO Alarm: At a Glance
A portable extinguisher is for an incipient fire only. OSHA 29 CFR 1910.157 and NFPA 10 both scope portable units to a fire still small enough to be approached safely with an escape route at your back. If it has spread beyond that, the correct action is to evacuate and call the fire service.
The Kidde Nighthawk KN-COB-B-LP is a battery-powered carbon monoxide alarm from Kidde's trusted Nighthawk series, featuring a digital display that shows CO concentration in parts per million (PPM) in real time. Combining the Nighthawk platform's proven detection technology with the flexibility of battery operation, the KN-COB-B-LP is an ideal CO safety solution for rental properties, seasonal facilities, construction sites, temporary workspaces, and any environment where AC power is unavailable or installation is not practical. The digital PPM display provides continuous monitoring visibility — a significant advantage over basic audible-only alarms — enabling safety-conscious operators to track CO levels at a glance and respond proactively. UL 2034 listed and backed by Kidde's decades of fire and CO safety expertise, the KN-COB-B-LP is a reliable, professional-grade choice for portable CO detection.
- Power: Battery-operated (no AC power or wiring needed)
- Display: Digital LED showing CO concentration in PPM
- Series: Nighthawk
- Certification: UL 2034 listed
- SKU: KN-COB-B-LP
Why Choose the Kidde Nighthawk KN-COB-B-LP?
The Nighthawk brand has earned a strong reputation among safety professionals and facilities managers for dependable CO detection technology. The KN-COB-B-LP extends this reputation into the battery-operated segment, delivering Nighthawk-grade detection capability in a portable, self-contained form factor. For operators managing properties with diverse power situations — from fully equipped commercial buildings to remote seasonal cabins — the KN-COB-B-LP provides a consistent, familiar CO detection platform that works wherever it's needed.
The digital PPM display is a key differentiator that elevates the KN-COB-B-LP above basic battery CO alarms. Safety professionals who need to assess CO levels during site visits, tenant inspections, or emergency response scenarios benefit significantly from a unit that shows actual CO concentration rather than simply alarming at threshold levels. The Nighthawk platform's sensor technology is designed for stable, long-term performance — meaning the digital readings are reliable and accurate over the unit's service life, supporting consistent data for safety audits and compliance documentation. For bulk buyers and safety program managers, the Nighthawk brand also simplifies staff training and maintenance procedures, as unit operation and testing protocols are consistent across the product line.
Key Features
- Battery-operated design — fully portable, no AC power or installation required
- Nighthawk series — Kidde's proven professional CO detection platform
- Digital LED display shows real-time CO concentration in PPM
- UL 2034 listed for U.S. commercial and residential compliance
- Electrochemical sensor technology for accurate, long-term CO detection
- Peak CO level memory records highest detected concentration
- Low battery warning indicator for continuous readiness monitoring
- Test/reset button for easy verification during safety inspections
- 85 dB audible alarm for clear occupant notification
- End-of-life alert when unit requires replacement
- Freestanding or wall-mountable for flexible placement
- Manufactured by Kidde, a Carrier company and global CO safety authority
Real-World Benefits
Property managers and short-term rental operators find the KN-COB-B-LP invaluable for maintaining continuous CO coverage in units where AC power may be disconnected between occupancies, or where outlet placement makes plug-in alarms impractical. Battery operation ensures CO protection is active from the moment the unit is placed — no waiting for electrical work, no outlet compatibility concerns, and no disruption to the property's aesthetic. The Nighthawk brand recognition is also an asset when communicating CO safety practices to tenants and guests, who may be familiar with the name from personal safety research.
Emergency preparedness programs rely on battery CO alarms as a critical component of rapid-deployment safety kits. When natural disasters, power outages, or infrastructure failures force communities to rely on generators, portable heaters, or other combustion equipment, CO risk rises dramatically. Safety coordinators maintaining stock of KN-COB-B-LP units can deploy them quickly in affected areas, providing CO monitoring capability that doesn't depend on the grid. The digital display supports rapid situational assessment — responders can check PPM readings in multiple locations efficiently, prioritizing evacuation or ventilation efforts based on actual data.
Construction site safety officers appreciate the KN-COB-B-LP's durability and portability for protecting workers in enclosed or semi-enclosed spaces with diesel or propane equipment. The ability to place the unit directly in the work area — without running extension cords or modifying temporary structures — makes compliance with OSHA CO protection requirements straightforward and documentable.
Applications and Ideal Use Cases
The Kidde Nighthawk KN-COB-B-LP serves any application requiring portable, battery-powered CO detection with digital monitoring capability. Priority use cases include short-term rental and vacation properties, construction sites and job trailers, emergency preparedness and disaster response kits, seasonal and remote facilities, rental units undergoing turnover, facilities with temporary power interruptions, marine and recreational vehicle environments, and small business locations with combustion appliances and no convenient AC outlet access.
Product Specifications
| Spec | Detail |
|---|---|
| SKU / Model | KN-COB-B-LP |
| Brand | Kidde Nighthawk (a Carrier company) |
| Power Source | Battery-operated |
| Display | Digital LED, PPM readout |
| Interconnect | No |
| Sensor Technology | Electrochemical |
| Certification | UL 2034 |
| Alarm Sound Level | 85 dB at 10 feet |
| Operating Temperature | 40°F–100°F (4.4°C–37.8°C) |
| Mounting | Freestanding or wall mount |
Related Products and Resources
- Browse All CO Detectors at WC Safety
- Head Protection Products
- Hearing Protection
- Disposable Respirators
- WC Safety Product Reviews Blog
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Written by Steven Eaton, WC Safety editor. WC Safety is an independent PPE review site, holds no inventory and sells nothing directly; Amazon links are affiliate links that earn a commission at no cost to you and never affect the assessment. This page is not medical, legal or regulatory advice.
Related standards and selection guidance: best fire extinguishers 2026, best first alert smoke detector 2026, best hardwired smoke detector 2026, best kidde smoke detector 2026.
To see what else meets the same specification, start with carbon monoxide gas monitors, combo smoke co alarms.
Brand / Vendor
Kidde
Model / SKU
KN-COB-B-LP
Product Type
Carbon Monoxide Alarm
Condition
New
Price
$26.99 (Amazon)
Rating
4.5 / 5 — 329 Amazon ratings
Availability
Check current availability on Amazon
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Coverage focuses on equipment built for professional use in manufacturing, construction, and industrial environments.
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Product information is compiled from manufacturer specifications, published standards information, compatibility data, and other cited sources.
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Verified Buyer Reviews
Customer Reviews
★★★★☆4.5 / 5· 329 ratings on Amazon
★★★★★
Reassuring!
Inexpensive without all the bells an whistles of the more expensive ones.I use it at my cabin where I heat with a wood stove. The cabin is small, and non insulated (Northerrn Michigan), and used mainly for hunting in the fall. It operates on batteries---which is fine and dandy since we have no electricity in the middle of the swamp.Over the last 3 years, this has saved our butt on 2 occasions, by going off at night and waking us from our sleep. Both nights were below 20 degrees, so we had the wood stove really kicking out the heat(and rapidly using up the oxygen in the cabin). We exited the cabin, let it air out good, and then reoccupied it. Glad these are dependable. I also make sure to put fresh batteries in every fall.We leave a window cracked about an inch now since these 2 incidents, and haven't had a problem since.
Verified Purchaser · February 1 · ✓ Amazon Verified Purchase
★★★★★
Great look, good price, easy Install.
I picked this up and am gonna have to buy more. Out of the packeage this comes with the batteries needed to work, durecell, and screws. Its an easy two screw install: two screws mount the back plate to the wall, and the monitor slides down on the plate to mount. Aesthetically: it looks like a thermostat, about the same size too. I put this in the middle of the wall towards the end in the middle of the room, and I dont even notice it. I have to tell you, compared to the rest, this looks the best. I bought a different brand and it looks like a huge box... Unlike this! There are about several different alarms to tell you whats going on with the unit. Several different language instructions are included.
Verified Purchaser · December 3 · ✓ Amazon Verified Purchase
★★★★☆
inexpensive
Batteries are hard to install, can't use rechargeable batteries, no frills detector that powers on
Verified Purchaser · February 7 · ✓ Amazon Verified Purchase
★★★★★
Carbon monoxide detector
Great product. Easy to handle if emergency happens
Verified Purchaser · March 15, · ✓ Amazon Verified Purchase
★★★★★
Work fine
I bought two of these Kidde KN Nighthawks. Very easy to install and tested and it work fine. The shape is not round which I like b/c I don't want it to looks like another smoke detectors. I putted it by my mbr and in the hallway to my other bedrooms.
Verified Purchaser · October 14 · ✓ Amazon Verified Purchase
★★★★★
Decent price
Decent price for the carbon monoxide detector. Installation was easy, but battery install was very "tight" to get batteries (supplied) in. 3 AA batteries supplied which is always nice. Manual & packaging states 10 year expiration. Purchased 11/2018, detector has a 07/2017 manufacture date on the inside. However, manual also states "... 10 years from initial power up,,,"
Verified Purchaser · November 2 · ✓ Amazon Verified Purchase
★★★☆☆
No apprent problem
No problem to judge whether it is good or not so far. So, I give 3 stars so far. It would be better if it showed the CO level and indicate whether it is in danger zone or not. but I guess that will cost more.
Verified Purchaser · July 20, 2 · ✓ Amazon Verified Purchase
Showing 7 of 329 Amazon reviews.
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Frequently Asked Questions
What makes the Nighthawk KN-COB-B-LP different from a standard battery CO alarm?
The KN-COB-B-LP belongs to Kidde's Nighthawk series, which is known for reliable electrochemical CO detection and quality construction. It features a digital PPM display that shows actual CO concentration continuously — unlike basic battery alarms that only alarm at threshold levels. This provides proactive monitoring capability and actionable data for safety professionals.
Is the KN-COB-B-LP suitable for use in rental properties?
Yes. The KN-COB-B-LP is an excellent choice for rental properties, offering battery-operated independence from outlet availability and UL 2034 compliance to meet state and local CO alarm mandates. Its digital display also makes it easy for tenants and property managers to confirm the unit is active and monitoring.
Does the KN-COB-B-LP include a low battery warning?
Yes. The unit includes a low battery warning indicator that alerts users when battery replacement is required, ensuring continuous CO monitoring readiness. It is important to check and replace batteries on a regular schedule as part of your facility safety maintenance program.
Can I use the KN-COB-B-LP on a construction site?
Yes. The KN-COB-B-LP is UL 2034 listed and suitable for deployment on construction sites and temporary work areas where combustion equipment is used. Its battery operation and portable design make it practical for use in trailers, enclosed spaces, and areas without AC power access.
What is the service life of the KN-COB-B-LP?
Kidde recommends replacing CO alarms every 5–7 years. The KN-COB-B-LP includes an end-of-life signal to notify users when the unit should be replaced. Document installation dates and maintain a replacement schedule as part of your safety management program.
Does WC Safety offer bulk pricing on the KN-COB-B-LP?
Yes. WC Safety supports bulk and volume purchasing for commercial customers, property management companies, and institutional safety programs. Contact us to discuss quantity pricing, freight options, and procurement support.
Where should a carbon monoxide alarm be installed?
On every level of the home and outside each separate sleeping area. CO mixes with air rather than rising like smoke, so height matters less than proximity to where people sleep. Keep it away from fuel-burning appliances and vents, which cause nuisance alarms.
How long do CO alarms last?
The electrochemical sensor is consumable - typically 7 to 10 years from the date of manufacture, not from the date of installation. Most units now announce end-of-life; when they do, the unit is replaced, not re-batteried.
What should I do when it sounds?
Get everyone into fresh air first, then call the fire service or the gas utility from outside. Do not re-enter to hunt for the source and do not open windows first - ventilating before the responder arrives can mask the reading they need to find the fault.
Is a combination smoke and CO alarm as good as two separate units?
For coverage, yes, and it removes one ceiling fixture. The trade-off is lifetime: the two sensors age differently, so the combination unit is retired on the earlier of the two dates.
Does this replace calling emergency services?
No. First aid supplies stabilise and buy time. Any loss of consciousness, breathing difficulty, uncontrolled bleeding, a chemical exposure to the eye, or a burn beyond a small superficial area is a call for professional help first.
Where should it be stored?
Somewhere unlocked, signposted and reachable in seconds. A kit in a locked office is not readily available under 1910.151, and neither is one behind a stack of boxes - which is the usual real-world failure.