🔍 Click to zoom
Kidde COB Battery-Powered Carbon Monoxide Alarm
$26.97
Final price set by Amazon · may vary
EDITORIAL REVIEW: 4.5/5 — WC Safety Review of the kidde cob, a residential carbon monoxide alarm. Editorial assessment by Steven Eaton, WC Safety editor, based on published Kidde specifications and category fit. We ...
Key Features
- Alarms at dangerous CO levels for fast evacuation
- Compact design for home and travel use
- Long-lasting AA batteries — replaced annually
- 85 dB alarm with flashing light alert
- Flexible tabletop or wall-mount placement
- 10-year limited warranty
🔒 Amazon Associate · You pay the same price · We earn a small commission
Zero Sponsored ListingsNo paid placements. Every recommendation is based on compliance, build quality, and field performance.
Curated SelectionExpert-chosen safety gear
Independently ReviewedUnbiased assessments — no manufacturer input
Built for Industrial BuyersSourced and reviewed for safety managers, procurement teams, and field supervisors.
EDITORIAL REVIEW: 4.5/5 — WC Safety Review of the kidde cob, a residential carbon monoxide alarm.
Editorial assessment by Steven Eaton, WC Safety editor, based on published Kidde specifications and category fit. We did not laboratory-test this product.
Editorial assessment by Steven Eaton, WC Safety editor, based on published Kidde specifications and category fit. We did not laboratory-test this product.
The Kidde COB is a battery-powered carbon monoxide alarm that keeps watching for CO even when the power is out - the very time some CO risks rise as generators and space heaters run.
CHECK PRICE ON AMAZON → SHOP CARBON MONOXIDE ALARMS →
As an Amazon Associate, WC Safety earns from qualifying purchases.
Why the kidde cob guards against carbon monoxide
Carbon monoxide gives no warning of its own, so a home needs an alarm that never stops watching. The battery-powered Kidde COB installs anywhere without wiring and stays on through an outage. As carbon monoxide alarms go, this is the cord-free, outage-proof pick, and the best CO detector guide and the CO placement guide put it in context. It watches for CO wherever you place it, wiring or not.
Safety first: a carbon monoxide alarm is a life-safety device — if it sounds, get everyone to fresh air outside and call 911 or the fire department, then have the source found and fixed by a professional. This is a residential early-warning alarm; it is not built for occupational settings where CO can climb to IDLH concentrations that demand industrial gas-detection instruments and rescue procedures, so use the right tool for each environment. Keep fresh batteries in it, place it per the manufacturer manual and local codes, and replace the unit at its end-of-life date.
What the kidde cob listing documents
From the listing: battery power for outage protection; a Kidde-brand build; and residential carbon monoxide detection. These are true carbon monoxide alarm and CO alarm credentials as a residential CO alarm. Confirm the power source, UL 2034 listing, and end-of-life date on the listing. As with any life-safety device, the alarm or extinguisher is one layer of home protection — combine detection, suppression, an escape plan, and regular testing rather than relying on a single device. Buy from a listing that states the specifications and safety listings plainly, keep the paperwork, and note the manufacture and end-of-life dates when it arrives so replacement never slips, because a device past its service life can fail silently exactly when it is needed most.
How the kidde cob compares
Weigh it against the Kidde COP plug-in, the Kidde KN-COB-IC, the Kidde KN-COB-LP2, the Kidde KN-COEG-3, the Kidde 30CUAR combo. The CO exposure symptoms guide and the garage CO guide help you choose.
Choosing the right home life-safety device
Match the device to the hazard and the room: smoke alarms for fire, CO alarms for combustion appliances and attached garages, combination units where you want both, and a rated extinguisher within reach of the kitchen and shop. Browse the carbon monoxide alarms, CO detectors, Kidde CO alarms, smart CO alarms, smoke & CO alarms collections; and read the home fire safety guide to plan whole-home coverage.
Where it fits by home and orders
The Kidde COB suits bedrooms, hallways, and rooms without a nearby outlet where a cord-free CO alarm is easiest to place - compare it with the X-Sense SC07, browse the wider CO detectors and Kidde CO alarms ranges, and add units on every level and near sleeping areas for whole-home coverage. Whole-home coverage is the goal: an early-warning device in each key room, a rated extinguisher within reach of the highest-risk spots, and a practiced escape plan tie the pieces together, so read the home fire safety guide to map what each level of your home still needs. For multi-unit or property orders, quantity purchasing runs through a free Amazon Business account — volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations, with the walkthrough linked in our footer.
Frequently asked questions
What is the kidde cob?
A battery-powered carbon monoxide alarm. It warns of carbon monoxide, a colorless, odorless gas from combustion appliances, engines, and blocked flues, so occupants can get to fresh air before exposure becomes dangerous.
How is it powered?
Confirm the power source on the listing - battery, plug-in with battery backup, or hardwired. Battery-backup and sealed-battery models keep working through a power outage, which is when some CO risks rise.
Where should I place it?
Follow the manufacturer manual and local codes: generally on every level and near sleeping areas, away from dead-air spots. See our CO placement guide for room-by-room guidance.
What do I do if it sounds?
Treat every alarm as real: get everyone to fresh air outside and call 911 or the fire department, then have the CO source found and fixed by a professional before returning.
Is it the same as an industrial CO monitor?
No. This is a residential early-warning alarm. Occupational settings where CO can reach IDLH levels need industrial gas-detection instruments and rescue procedures. Use the right tool for each environment.
Does it detect smoke or other gases?
A CO-only alarm detects carbon monoxide only unless the listing states otherwise. For smoke too, choose a combination smoke/CO alarm. Confirm what this model detects on the listing.
How long does it last?
CO sensors have a service life, typically several years, after which the unit must be replaced, not just re-batteried. Confirm the end-of-life date and replace the alarm on schedule.
How often do I test it?
Test with the button monthly and follow the manufacturer's maintenance schedule. A CO alarm you never test is a CO alarm you cannot trust.
Can it be interconnected?
Some models interconnect so one alarm triggers all. Confirm interconnect capability and compatibility on the listing if you want whole-home alerting.
Is it UL listed?
Confirm the current UL 2034 listing on the product page. A CO alarm should carry the applicable safety listing for residential use.
Does a CO alarm replace appliance maintenance?
No - it is a last-line warning. Have fuel-burning appliances, flues, and vents inspected on schedule so CO is prevented at the source, not just detected.
How do I order several?
Quantity purchasing runs through a free Amazon Business account - volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations. The bulk-ordering walkthrough is linked in our footer.
Brand / Vendor
Kidde
Model / SKU
COB
Product Type
Carbon Monoxide Alarm
Price
$26.97 (Amazon)
Rating
4.8 / 5 — 1461 Amazon ratings
Availability
Check current availability on Amazon
No Paid Placements
Every product earns its place based on safety credentials and field performance, not advertising spend.
Industrial Grade Only
Products sourced for professional use in manufacturing, construction, and industrial environments.
Compliance Verified
Every product listed on WC Safety is reviewed for standards compliance and safety credentials before publication.
Sourced for Professionals
Gear selected for safety managers, procurement teams, and field supervisors — not casual consumers.
Verified Buyer Reviews
Customer Reviews
★★★★★4.8 / 5· 1,461 ratings on Amazon
★★★★★
Top-notch in every way
Perfect travel companion and home safety deviceI bought this Kidde CO detector for peace of mind during hotel stays and road trips. It's compact and runs on two AA batteries, making it truly portable. The 85 dB alarm is loud enough to wake me from a deep sleep. I appreciate the LED status indicators that show normal operation or alarm condition. During a recent power outage, it kept working without issue.Pros: portable, battery-powered, reliable sensitivity, easy to mount or stand. Cons: no digital display for exact CO levels, but for a travel model that's acceptable.Overall, this is a must-have for anyone who stays in hotels or wants backup protection at home. I highly recommend it for its simplicity and effectiveness.
Verified Purchaser · May 25, 20 · ✓ Amazon Verified Purchase
★★★★★
Works as it should! Highly recommend!
Works as it should without issues. Tested upon receipt and no issues. Easy to set up and set in use. Good value for money. Compact enough to take when you travel, too. Can be set on a table or hung on a wall with attached screws and anchors. Highly recommend it!
Verified Purchaser · April 1, 2 · ✓ Amazon Verified Purchase
★★★★★
awesome
I purchased this as a gift and it was a good value for my money. The instructions were easy to follow and can be moved from place to place as needed. It appears to be reliable and good battery life. Very limited noise. The person who received the gift loved it and glad they received it.
Verified Purchaser · April 4, 2 · ✓ Amazon Verified Purchase
★★★★★
Kidde carbon monoxide detector
I’m very happy with my carbon monoxide detector. I put it on my kitchen counter next to the stove and so far I’m happy with it. It’s flashes a green light to let you know that it’s working thank God I hope I never have to hear it go off, but I would highly recommend it for anyone who doesn’t have the space to plug it in. It is portable. You can put it anywhere. it does require two AA batteries.Too soon to tell how long the battery life is, but I’ll do a follow up on that sometime in the future
Verified Purchaser · June 11, 2 · ✓ Amazon Verified Purchase
★★★★★
Excellent value
Easy install and works great!
Verified Purchaser · May 30, 20 · ✓ Amazon Verified Purchase
★★★★☆
Worth buying.
Ordinary and functional, easy to set up.
Verified Purchaser · March 7, 2 · ✓ Amazon Verified Purchase
★★★★★
Long lasting and reliable
This is only the second time I have had to buy one of these in the 10 years I have been in my house. I am buying the exact same one again because it lasts so long. It’s not very big so it’s easy to have mounted, or just sitting on a shelf. I knew it was time to buy a new one because it chirps when the device needs to be replaced. Initially I thought it needed new batteries, but after replacing them and still hearing a chirp, I looked it up. Highly recommend this.
Verified Purchaser · May 25, 20 · ✓ Amazon Verified Purchase
★★★★★
Very reliable
This is a great detector, it last about 10 years and lets you know when to replace. I replaced mine with a new one of the same brand when it was time.
Verified Purchaser · May 2, 202 · ✓ Amazon Verified Purchase
★★★★★
Good Value for Peace of Mind
My oil-fired boiler in the basement is the only potential source of carbon monoxide in my house. The old monitor was in use for over 25 years, so I figured it was past due (probably long past due) for replacement, and I was hoping that when I powered it up it wouldn’t start beeping right away. The good news is that it hasn’t made a peep. The entire process of opening the package, inserting the included batteries (two AAA’s), testing it and setting it on top of my indirect water heater took less than 3 minutes. I plan on this being the last one I buy.
Verified Purchaser · June 15, 2 · ✓ Amazon Verified Purchase
★★★★★
Sleep well with Kidde detectors
My first two Kidde units lasted 10 years and never gave a false alarm. Batteries seem to last forever. When you trust your life to a CO detector, don't Kidde around, get a Kidde ... or two. I just bought two more, so I'm good for another decade!
Verified Purchaser · June 11, 2 · ✓ Amazon Verified Purchase
Showing 10 of 1,461 Amazon reviews.
Share Your Experience
Write a Review
Thank you for your review!
Your submission has been received and will be published after verification.