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Kidde COBD Carbon Monoxide Alarm, Portable AA with Digital Display
$31.97
Final price set by Amazon · may vary
EDITORIAL REVIEW: 4.5/5 WC Safety Review — the Kidde COBD carbon monoxide alarm Editorial assessment by the WC Safety Editorial Team, based on published Kidde specifications and category fit. We did not laboratory...
Key Features
- Backlit digital display shows CO concentration levels
- Alarms at dangerous CO levels for fast evacuation
- 85 dB alarm with flashing light alert
- Long-lasting AA batteries
- Flexible tabletop or wall-mount placement
- No low battery chirps at night
- 10-year limited warranty
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EDITORIAL REVIEW: 4.5/5 WC Safety Review — the Kidde COBD carbon monoxide alarm
Editorial assessment by the WC Safety Editorial Team, based on published Kidde specifications and category fit. We did not laboratory-test this product.
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Kidde COBD Carbon Monoxide Alarm, Portable AA with Digital Display Overview
The Kidde COBD carbon monoxide alarm is a portable, AA-battery CO detector with a backlit digital display. It runs on two included AA batteries rather than a sealed 10-year cell, so it installs without wiring and can be wall-mounted or placed on a tabletop. The display shows the carbon monoxide level in ppm, and it has an 85-dB alarm, LED status indicators, and a Test/Hush button.
As the Kidde COBD, this portable CO detector with display is light enough to pack. As an AA battery CO alarm it needs no outlet, as a travel carbon monoxide detector it protects you in hotels or rentals, and as a compact CO alarm it fits on a nightstand or shelf.
This is a CO alarm only, not a smart, air-quality, gas, or smoke model, it uses AA batteries rather than a sealed cell, and it uses standard rather than low-level thresholds. Compare it against other carbon monoxide alarms and detectors, the sealed-battery Kidde COBD10, the wider Kidde CO alarms range, or a smart CO alarm if you want app alerts, before ordering.
What This Alarm Is Built For
| Use case | Fit | Buyer guidance |
|---|---|---|
| Travel and portable use | Purpose-built | AA power and compact size make it easy to pack. |
| Seeing CO readings | Strong | Backlit display shows the CO level in ppm. |
| No-wiring home CO | Strong | Wall-mount or tabletop; no outlet needed. |
| Budget CO protection | Strong | One of the most economical Kidde CO alarms. |
| Low-level alerts / sealed battery | Verify first | Choose the COBDL for low-level or COBD10 for sealed. |
A carbon monoxide alarm is a life-safety device, so treat any CO alarm as an emergency: get to fresh air, call for help, and have the source fixed by a professional. This is a residential early-warning alarm; it is not built for occupational settings where carbon monoxide can climb to IDLH concentrations that demand industrial gas-detection instruments and rescue procedures, so use the right tool for each environment. Keep fresh AA batteries in it, place it per the Kidde manual and local codes wherever you use it, use the digital reading to understand the situation rather than to delay evacuation during an alarm, and replace the unit per its end-of-life guidance. Learn placement and CO risks in our CO detector placement guide and carbon monoxide exposure symptoms guide.
Pros & Cons
Pros
- Portable AA battery power for travel
- Backlit digital ppm display
- No wiring; wall-mount or tabletop
- One of the most economical Kidde CO alarms
- UL 2034 5th Edition tested and ETL Listed
Cons
- AA batteries, not a sealed 10-year cell (see COBD10)
- Standard thresholds, not low-level (see COBDL)
- No WiFi, app, air quality, gas, or smoke
- Batteries need periodic replacement
How It Compares
The COBD is Kidde's compact, portable CO alarm with a display. Weigh it against the alternatives before ordering:
| Option | Battery | Alerting | Best for |
|---|---|---|---|
| Kidde COBD (this page) | AA (portable) | Standard | Travel and budget CO with a display |
| Kidde COBD10 | Sealed 10-year | Standard | Fixed, maintenance-free home alarm |
| Kidde COBDL | AA (portable) | Low-level (30 ppm) | Earlier alerts for sensitive people |
Choose the COBD for a portable, budget CO alarm with a readout, the COBD10 for a sealed 10-year battery, or the COBDL for low-level alerting. See our best carbon monoxide detectors guide, the best garage CO detector guide, and, for work settings, the best industrial CO monitor guide.
Specifications
| Brand | Kidde |
| Model | COBD |
| Type | Portable carbon monoxide alarm with digital display (CO only) |
| Power | Two AA batteries (portable); no wiring; wall or tabletop |
| Display / Controls | Backlit digital ppm display; LED status indicators; Test/Hush button |
| Alarm / Listing | 85 dB; standard CO thresholds; UL 2034 5th Edition, ETL; 10-year warranty |
Related Guides
best carbon monoxide detectors, CO detector placement guide, carbon monoxide exposure symptoms, best garage CO detector, best industrial CO monitor.
Related Resources
carbon monoxide alarms and detectors Kidde CO alarms CO detectors smart CO alarms
Frequently Asked Questions
How is the Kidde COBD powered?
It runs on two included AA batteries, not a sealed 10-year battery, so it installs without wiring and keeps working during a power outage. Replace the AA batteries as needed and follow the low-battery signal to keep it protecting you.
Can I take the COBD traveling?
Yes. It is compact and AA-battery powered, so it is designed for travel or home use. You can bring CO protection to a hotel, vacation rental, cabin, or RV where a fixed alarm may not be installed.
What does the display show?
It has a backlit digital display that shows the current carbon monoxide level in ppm, so you get a numeric reading rather than just an alarm sound. LED status indicators confirm normal operation at a glance.
Is this the sealed 10-year COBD10?
No. The COBD is the AA-battery, portable version, while the COBD10 uses a sealed 10-year never-replace battery for a fixed, maintenance-free install. Choose the COBD for portability or the COBD10 for a sealed battery.
Does the COBD have low-level CO alerting?
No. The COBD uses standard CO alarm thresholds. If you want an earlier low-level alert starting at 30 ppm, look at the COBDL, which adds low-level detection on a similar AA-battery portable platform.
Where can I install or place it?
It can be wall-mounted or set on a tabletop, so you can mount it in a room or set it on a nightstand or shelf. Follow the Kidde manual and local codes for the recommended location wherever you use it.
Is it a smart or WiFi alarm?
No. The COBD is a standalone alarm with a local horn, digital display, and LED; it does not connect to WiFi or a phone app. If you want app alerts, choose a smart CO alarm instead.
Does it detect gas, smoke, or air quality?
No. It detects carbon monoxide only. It does not detect natural gas, propane, or smoke, and it does not monitor air quality. Choose a different Kidde model if you need any of those functions.
What is the Test/Hush button for?
The Test/Hush button lets you test the alarm's function and temporarily silence a nuisance alarm. Along with the LED indicators, it gives you simple control and a quick status check on this compact model.
Is it certified?
Yes. Kidde states the COBD is tested to UL 2034 5th Edition and is ETL Listed, with a 10-year limited warranty. Note the 10 years is the warranty, not a sealed battery, since this model uses replaceable AA batteries.
How loud is it?
It sounds an 85-decibel alarm when carbon monoxide reaches the alarm threshold, which is designed to be heard through a room or home, and the digital display and LED add a visual indication.
What should I do when it alarms?
Treat a CO alarm as an emergency: move everyone to fresh air immediately, call emergency services or your gas utility, and do not re-enter until it is cleared. Then have the CO source found and fixed by a qualified professional.
Written by Steven Eaton, WC Safety Editorial. Specifications sourced from Kidde published data. Compare the range in carbon monoxide alarms and detectors.
WC Safety is an independent PPE retailer and Amazon Associate; no paid placement. Match the alarm to your home and follow the manufacturer manual and local codes.
Brand / Vendor
Kidde
Model / SKU
COBD
Product Type
Carbon Monoxide Alarm
Price
$31.97 (Amazon)
Rating
4.9 / 5 — 10 reviews
Availability
Check current availability on Amazon
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Verified Buyer Reviews
Customer Reviews
★★★★★4.7 / 5· 19,759 ratings on Amazon
★★★★★
A Must Have For Protection
Well made. Works well. I installed it in minutes.Recommended for every home.
Verified Purchaser · June 7, 20 · ✓ Amazon Verified Purchase
★★★★★
Good CO Alarm
The alarm is reliable. The CO level reading is excellent for confirmation of the presence of carbon monoxide. I do not have a gas stove in my condo, so my previous alarm for the last 10 years did not sound the alarm when I was at home. However, I did take the alarm for a test in my car and in Los Angeles' traffic jam about 9 years ago. The alarm did not sound off when my car windows were closed during a long journey with air recirculation inside. But when I opened my car windows during a very heavy traffic jam to test the air outside, the alarm did sound off briefly with a reading showing a low level of carbon monoxide.Please note that the 10-year warranty begins when the alarm is first installed. The life span of the sensor is also 10 years, starting from the date of power on. Google AI says the 10-year warranty and the life span of the sensor both start on the date of manufacturing, but that is wrong information. In fact, when the alarm is sealed in the plastic package, the sensor undergoes only insignificant degradation. Therefore, the sensor is good for 10 years when unpackaged and installed and the 10-year warranty starts when the alarm is first powered on. Kidde should provide better training for its customer service so that they don't give the same wrong information Google AI gives.
Verified Purchaser · May 16, 20 · ✓ Amazon Verified Purchase
★★★★★
It’s UL-certified, so I know it meets safety standards
I purchased this kidde co detector for our car or when we travel. I got this brand coz it’s UL-certified, so I know it meets safety standards and has been properly tested that alone gives me confidence it’s reliable.Setup was easy since it runs on AA batteries, no wiring or complicated installation required. The LED indicators make it simple to check status at a glance, and the test/reset button works smoothly. It also says there will be low-battery alert, so it won’t quietly stop working without me knowing.The portable size is another bonus it’s easy to move if I want coverage in other places, or even take it along when traveling. For anyone looking for a trusted, approved, and low-maintenance CO alarm, this one really covers the essentials. You have to do research before buying
Verified Purchaser · September · ✓ Amazon Verified Purchase
★★★★☆
Great value, but hanging holes don't match previous screw.
Replaced an old Kidde that reached end-of-life. Expect the same, even longer ifespan and accuracy of this unit. Only reason for 4 stars is that the hanging holes on the back didn't line up with the screws from their previous model.
Verified Purchaser · May 17, 20 · ✓ Amazon Verified Purchase
★★★★★
Peace of Mind in a Compact, Reliable Device
The Kidde Carbon Monoxide Detector is one of those small investments that delivers huge peace of mind. After installing it in my home, I immediately felt more secure knowing that my family is protected from something as serious—and silent—as carbon monoxide exposure.Setup was incredibly easy. It took just a few minutes to install, and the instructions were clear and straightforward. The digital display is a nice touch—it gives real-time CO levels, which adds an extra layer of reassurance beyond just an alarm.What really stands out is its reliability and thoughtful design. It has a clear, loud alert that’s hard to miss, and the test/reset button works without a hitch. I also appreciate that it’s battery-operated with a backup option, so it continues working even during power outages.In a world where safety often gets overlooked until it’s too late, this detector provides consistent, quiet protection you can depend on. If you’re looking for an easy-to-use, durable, and accurate carbon monoxide detector, Kidde is a brand you can trust—and this unit proves it.Highly recommended for any home, apartment, or even RV. It’s a small device that could make a life-saving difference.
Verified Purchaser · May 27, 20 · ✓ Amazon Verified Purchase
★★★★★
Tested with CO in closed container at varying concentrations. Worked very well!
With emergency products like CO detectors, it's hard to know if they really work unless you're actually being exposed to dangerous amounts of CO. And if a CO detector doesn't work, you wouldn't know; instead, you'd just be poisoned while thinking that nothing was wrong. The only way to really find out if it works is to put it in an airtight container and generate CO.Because I like to play with dangerous chemicals at home, I decided to try this out. Adding formic acid to concentrated sulfuric acid causes the formic acid (HCOOH) to break down into CO and H2O. I got both of these chemicals for less than $10/liter apiece, plus shipping. I put some sulfuric acid into a graduated cylinder and placed it in a 1-gallon airtight plastic container. I then added small amounts of diluted formic acid and rapidly closed the container.Sure enough, it worked! It registered CO concentrations that were well within the ballpark of what I'd expect to get with the amount of formic acid I added (using the ideal gas law to figure out what the maximum CO level would be). In high concentration tests, I found that the alarm goes off within 3 minutes of hitting 500 ppm (which is dangerous but would take several hours to kill, giving plenty of time to get to fresh air). In another test, it went off after about 20 minutes of CO levels around 190 ppm, which is dangerous but not lethal. Its peak reading is in the 910-920 ppm range; it doesn't display levels higher than that. Needless to say, it goes off within a minute or two of such high CO levels and anybody who sees 900+ ppm on the display should leave their house and seek medical help immediately.It worked well in low concentration tests too. Due to some strange US regulation, it displays "0" for any reading below 30 ppm. If you press the "peak level" button, though, it will tell you what its peak reading was even if it was below 30 ppm. This works down to the 10-15 ppm range, below which you don't really have to worry about CO at all. Prolonged exposure around 50 ppm leads to an alarm after a couple of hours.Another, simpler test (which anyone with a CO detector should do to make sure it's working) is to light a candle in an enclosed container with the CO detector, then close the container. The candle will burn through the available oxygen and a fair amount of incomplete combustion (releasing CO instead of CO2) will occur as it runs out of O2. I tried this and got 96 ppm with a small candle in my gallon container; a larger candle would probably release more. I then tried it by lighting a crumpled piece of newspaper in the container and got >910 ppm, which is reasonable because paper and wood experience pyrolysis, which releases lots of CO. Combustion of small amounts of acetone (a fairly clean fuel relative to paper) resulted in 300-550 ppm depending on how hot the fire got before I put the lid on; the lower reading relative to paper helps confirm that it's reading accurately.In conclusion - this $20 detector works very well when tested with real CO. It's accurate, the alarm goes off at dangerous CO levels, it only goes off if CO levels are dangerous, and it might just save your life.
Verified Purchaser · May 7, 201 · ✓ Amazon Verified Purchase
★★★★★
This is the End…after 10 years! Amazing product!
We purchased two of these units 10 years ago. They were really easy to install and very easy to use.We recently had an ice storm and we’re out of power and had to use generators back in January. Our carbon monoxide detector went off in one of our rooms, but it was one of those that just beeped four times. So I grabbed this unit off of the wall and brought it down to that room. The reading went from 0 up to 41 almost instantly. It basically lit up like a Christmas tree, and I immediately opened up all the doors and windows in that room and would periodically check very quickly to see if the number was going down and it did. It went all the way down to 0. So the fact that this has that digital read out on it with actual numbers was very important for peace of mind. It’s great that the other unit went off (also made by Kidde), so that it initially alerted us to the danger of carbon monoxide, but to have a display actually show you tangible numbers was very important.They say that these have a battery life of 10 years. As I mentioned first in this review, we bought two of these units 10 years ago. One of the alarms started beeping 3 times one evening about four days ago. When I looked at the unit, it displayed “End” on it and upon looking up what that meant. It literally means the unit isn’t the end of its lifecycle and needs to be thrown away. I had written “4/26” on the unit 20 years ago, so it literally lasted 10 years and one month. And tonight, the other one gave its last battle cry of 3 beeps and displayed “End.” So we have given it a proper goodbye and ordered a replacement that will arrive first thing in the morning.I had a family member pass away from carbon monoxide, so we take this very seriously and this unit gave us the ultimate Peace of mind.Whoever as Kidde tested and designed this deserves a raise! They nailed the 10-year lifespan! :)Thanks, Kidde!
Verified Purchaser · May 13, 20 · ✓ Amazon Verified Purchase
★★★★★
Great product
Great product. Works perfectly. Would buy again.
Verified Purchaser · June 18, 2 · ✓ Amazon Verified Purchase
★★★★★
Has not tripped yet -yea
The Kidee detector has not alerted yet! I mounted it a bit high at 1' below the RV ceiling. I have another CO/Propane detector mounted a few inches above the floor that is part of the RV safety system and has not have alerted either. CO is so insidious I figure that two are better than one and at two locations even better. If both trip it is out the door fast. Height positioning seems rather arbitrary and if I had only one I would put it at seat or bed height. If you are really paranoid buy the one time aircraft card type detector.
Verified Purchaser · May 7, 202 · ✓ Amazon Verified Purchase
★★★★★
Great detector - repeat buy!
After 10 years literally to the day of installing it, the detector chirped its "end of life" beep. We ordered another one since it worked so well for 10 years...here's to the next 10!
Verified Purchaser · June 3, 20 · ✓ Amazon Verified Purchase
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