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Kidde Smoke & Carbon Monoxide Detector with Voice Alerts, Battery Powered, Combination Smoke & CO Alarm

4.6 4.6 out of 5 stars 34,059 ratings
$67.24
Available at a lower price from other sellers that may not offer free Prime shipping.
1 Pack
Previous Model
Detector
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Purchase options and add-ons

Brand Kidde
Style Previous Model
Power Source Battery Powered
Color White
Product Dimensions 1.8"D x 5.6"W x 5.6"H
Alarm Audible
Operating Humidity 10% to 95% relative humidity, non-condensing
Upper Temperature Rating 37.8 Degrees Celsius
Sensor Type Ionization

About this item

  • 2 units in 1: unit alerts you to smoke & carbon monoxide by sounding a loud, 85-decibel alarm & sounding voice alerts
  • Ionization sensor technology senses invisible fire particles, while a electrochemical sensor detects CO gas
  • Voice Alarm & an 85-decibel alarm announces a hazard when detected: “Fire!” = smoke or fire or “Warning Carbon Monoxide” = CO gas, or "Replace Battery" when the battery needs to be replaced
  • Operates on 2-AA alkaline batteries, providing reliable detection during a power failure
  • Front-load battery door makes installation & replacement easy
  • Tamper-resistant design: deters removal of the carbon monoxide smoke detector combo from the ceiling
  • Test-Hush Button makes testing the detector or silencing false alarms easy (false alarms may occur from routine cooking, shower steam, dust or humidity)
  • UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.
› See more product details

Customer ratings by feature

Easy to install
4.5 4.5
Noise level
4.4 4.4
Value for money
4.3 4.3
Battery life
4.2 4.2
See all reviews
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Kidde Smoke & Carbon Monoxide Detector with Voice Alerts, Battery Powered, Combination Smoke & CO Alarm
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Kidde Smoke & Carbon Monoxide Detector
Kidde Smoke & Carbon Monoxide Detector
Kidde Smoke & Carbon Monoxide Detector

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Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please Click here [PDF ]

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Kidde Smoke & Carbon Monoxide Detector with Voice Alerts, Battery Powered, Combination Smoke & CO Alarm

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Product Description

The Kidde Smoke & Carbon Monoxide Detector with Voice Alerts, Battery Powered, Combination Smoke & CO Alarm, model KN-COSM-BA, provides two fire safety detectors in one unit through the use of ionization sensing technology that senses invisible fire particles, while an electrochemical sensor detects carbon monoxide. When a smoke, fire, or carbon monoxide event occurs, the Kidde fire alarm warns with an 85-decibel alarm sound, flashing LEDs, and voice alerts. For smoke detection, the alarm will sound with the announcement, "Fire! Fire!" and a red LED will flash in unison with the voice alarm. For carbon monoxide detection, the alarm will sound with the announcement "Warning! Carbon Monoxide!". In the event of a low battery, the detector will announce, "Low Battery!" The Kidde combination smoke and carbon monoxide alarm is powered by 2-AA batteries, which provide coverage during a power failure. A convenient pop-up, front-door battery compartment allows for quick installation or replacement of a battery without having to disconnect the entire unit from the ceiling. In the case of nuisance or false alarm, the Smart Hush button silences the unit for approximately 8 minutes, which is helpful when this smoke detector carbon monoxide detector combo sounds from things like routine cooking or shower steam. When installed, the green LED on the alarm will flash every 60 seconds in standby condition, letting you know that the unit has power & is operating correctly. Install a carbon monoxide smoke detector combo on every level of your home and near bedrooms to help keep your family safe. UL Certified with a 10-year limited manufacturers' warranty. Meets requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshal, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD).

Top Brand: Kidde

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Price$67.24$44.94$44.99$48.56-18% $39.99
Typical: $48.99		-6% $64.99
Typical: $68.98
Delivery
—
Get it as soon as Saturday, May 11
Get it as soon as Saturday, May 11
Get it as soon as Saturday, May 11
Get it as soon as Saturday, May 11
Get it as soon as Wednesday, May 15
Customer Ratings
4.64.6 out of 5 stars34,059
4.74.7 out of 5 stars163
4.84.8 out of 5 stars45
4.64.6 out of 5 stars341
4.44.4 out of 5 stars922
4.54.5 out of 5 stars1,499
Easy to install
4.5
4.4
—
4.2
4.3
4.5
Battery life
4.2
4.5
—
3.6
4.0
4.2
Value for money
4.3
—
—
4.2
3.9
4.0
Sold By
Amazon.com
Amazon.com
Amazon.com
Amazon.com
MYRKJ
EWholeSale LLC
power source
Battery Powered
Battery Powered
Battery Powered
Hardwired
Battery Powered
Battery Powered
sensor type
Ionization
Electrochemical, Photoelectric
Photoelectric
Electrochemical, Photoelectric
Photoelectric
Ionization
lower temperature rate
40 degrees fahrenheit
40 degrees fahrenheit
—
40 degrees fahrenheit
0 degrees celsius
40 degrees fahrenheit
upper temperature rate
37.8 degrees celsius
100 degrees fahrenheit
—
100 degrees fahrenheit
49 degrees celsius
100 degrees fahrenheit
style
Previous Model
6th Edition Alarm
Smoke, CO
6th Edition Alarm
Decibel
Previous Model
alarm
Audible
Smoke and Carbon Monoxide Alarm
Smoke, CO
Smoke and Carbon Monoxide Alarm
Audible
Audible
operating humidity
10% to 95% relative humidity, non-condensing
10%-95% relative humidity, non-condensing
—
10%-95% relative humidity, non-condensing
95 percent
—
weight
—
0.55 pounds
0.52 pounds
0.53 pounds
0.21 pounds
0.79 pounds

Important information

Bulb Voltage

3 volts

Customer reviews

4.6 out of 5 stars
4.6 out of 5
34,059 global ratings

Customers say

Customers like the ease of installation and value of the gas smoke fire alarm. They mention that it's simple to install and well worth the purchase. Customers appreciate the quality. That said, opinions are mixed on volume, voice, battery life, and safety.

AI-generated from the text of customer reviews

1,585 customers mention1,164 positive421 negative

Customers like the quality of the gas smoke fire alarm. They say it works well, is very sensitive, and the test worked perfectly. Some say they have had it for 2 months and have had no issues. Overall, most are satisfied with the product's quality and functionality.

"...I’m glad you have gas or electric. They’re perfect." Read more

"...The Pros: - Stand-alone operation - CO and Smoke Detection - Powered by only (2) AA batteries..." Read more

"...It may be a great item but no connection to other alarms so all sound simultaneously does not work with this item, be aware that it is also not..." Read more

"...I’ve had it for 2 months now, no issues." Read more

788 customers mention785 positive3 negative

Customers find the installation of the gas smoke fire alarm to be easy. They mention that it snaps into the ceiling and that the batteries are easy to put in.

"Easy to install. The voice volume is too low and not understandable for me, but I have bad hearing." Read more

"So easy to install, 15min and only a few tools gives you peace of mind" Read more

"...Easy setup. The one downside is I wish the voice alarm was louder...." Read more

"Simple installation" Read more

417 customers mention365 positive52 negative

Customers like the value of the gas smoke fire alarm. They mention it's well worth the purchase.

"...(in spite of what some of the negative reviews say). - It's inexpensive!..." Read more

"Nice price looks good" Read more

"I purchased a few of these last year at a great price. I changed the batteries and attempted to use Amazon AAs. The unit would not start...." Read more

"...We put Kidde alarms all over. They work well and the price is right." Read more

381 customers mention200 positive181 negative

Customers are mixed about the volume of the gas smoke fire alarm. Some mention that the alarm is nice and loud, while others say that the voice on the alarm was not loud enough to be considered part of the alarm.

"...It's a unique alarm since the voice tells you what the alarm is and you don't have to count beeps." Read more

"...Or are you just going to get out of the house? The alarm is going off for crying out loud! A fire should be readily apparent...." Read more

"...Pros-Easy to hear the problem (fire or CO2) and self test to make sure it's working...." Read more

"...It’s a bit on the loud side when it does go off, but aside from that, very happy with my purchase.I’ve had it for 2 months now, no issues." Read more

335 customers mention181 positive154 negative

Customers are mixed about the battery life of the gas smoke fire alarm. Some mention that the batteries are always good inside, and are easily replaceable. However, others say that it only takes certain batteries or it will not work. Some customers love that it uses two AA batteries instead of one 9 volt battery, while others say it starts going through batteries every couple of days.

"...I like that the 2 AA batteries can be changed from the front of the unit instead of having to twist them off the ceiling...." Read more

"Easy to install. The voice volume is too low and not understandable for me, but I have bad hearing." Read more

"...Like the fact that they are fire/carbon monoxide combos and should last roughly 10 years. They should be replaced at least every 10 years...." Read more

"...Reading the back of the alarm, it only takes certain batteries or it will not work!I've posted a photo of the acceptable batteries." Read more

118 customers mention70 positive48 negative

Customers are mixed about the voice. Some mention it has a very good and understandable voice alert with the sound alert also. They appreciate the voice instructions instead of just flashing lights. However, others say that the voice is difficult to hear, the volume for the voice announcements is a bit quiet, and they have never heard a voice response from the alarm.

"...It was helpful to read the instructions and learn that I'm not supposed to put the alarms within 36" of bathroom or kitchen door, for example...." Read more

"Easy to install. The voice volume is too low and not understandable for me, but I have bad hearing." Read more

"...Plus this has a test button (which I can reach!) and the unit is voice activated!..." Read more

"...and while the beep is certainly loud enough, the voice is difficult to hear...." Read more

103 customers mention53 positive50 negative

Customers are mixed about the safety of the gas smoke fire alarm. Some mention that it's very sensitive but good for their safety, and protects their family well. They like the long life, and say it does the job of keeping them safe and secure. However, others say that it was functional, but it never once triggered from real smoke.

"...Large 'hush' button which is very easy to reach. Sturdy base, but easy to twist alarm off of mount and text that says 'remove from source of smoke..." Read more

"...Last night, one randomly sounded "Fire" at 6am. Fire was nowhere to be found. We reset and reseated the battery and got the same result...." Read more

"...These replaced 10-year-old smoke detectors and have the added benefit of CO2 protection...." Read more

"...It took longer than I'd like to sound the alarm. Plenty of smoke was reaching the unit...." Read more

Only takes certain batteries!!!
4 Stars
Only takes certain batteries!!!
I purchased a few of these last year at a great price. I changed the batteries and attempted to use Amazon AAs. The unit would not start.Reading the back of the alarm, it only takes certain batteries or it will not work!I've posted a photo of the acceptable batteries.
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Top reviews from the United States

Amazon Customer
5.0 out of 5 stars Good product
Reviewed in the United States on April 27, 2024
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
I have satisfied with this product. In the future I will buy it again.
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Tracy Ragland
5.0 out of 5 stars Easily installed
Reviewed in the United States on March 29, 2024
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
Arrived promptly
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MDH911
5.0 out of 5 stars No Connection To Multiple Alarm System
Reviewed in the United States on January 31, 2024
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
Unfortunately, I need an alarm that would connect with others and this one does not have that feature. In the original description when you input the model number KN-COSM-IBA this is the item that comes up, but unfortunately the IBA part of the item does not exist. It may be a great item but no connection to other alarms so all sound simultaneously does not work with this item, be aware that it is also not returnable.
One person found this helpful
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Pamela drown
4.0 out of 5 stars Carbon monoxide detection
Reviewed in the United States on December 21, 2023
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
I only gave this a down star because the adhesive that comes with it will not hold you have to use the screws. That’s the only thing that is wrong with this say it and other ways it is really handy. I highly recommend having these in your home. I’m glad you have gas or electric. They’re perfect.
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Hoopy Frood
5.0 out of 5 stars Very Nice Solution for Our Needs -
Reviewed in the United States on September 1, 2016
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
In spite of the negative reviews, I decided to get this. And I am very glad I did! It's perfect for our application: we only live in a 700 sq ft place and only had need for one.

The Pros:
- Stand-alone operation
- CO and Smoke Detection
- Powered by only (2) AA batteries (much cheaper than 9V and I have lots of rechargeable batteries)
- Hush Mode
- IT WORKS... almost too well... (in spite of what some of the negative reviews say).
- It's inexpensive!

There is no down side I've seen (save the hush mode cancels itself when there's no smoke, rather than wait for the 9 minute timer to expire). The hush mode cancellation is hardly a big problem. It's just annoying when we roast coffee because we generate smoke about every 4 minutes for 15-20 minutes. Rather than 1-2 pushes on "hush" (if it was strictly timer-based) you have to push it every time you roast. Or just pull the batteries, then put them back in when you're done.

It is VERY sensitive. We don't generate much smoke when we roast coffee, but even though the detector is quite a ways from the source with very good ventilation it still goes off every time. Someone who reviewed this very negatively complained it wouldn't go off with a lighter under it. That's because it's a SMOKE detector. That same genius complained that it wouldn't detect CO with a "scooter" running in a closed garage. Modern vehicles (even small engines) generate far less CO than they did decades ago. Modern vehicles with catalytic converters will generate almost zero CO. One would need to get a lot more creative to test the CO alarm at home. I will not suggest how. I haven't tried. But I'm comfortable with Kiddie's reputation and if the smoke detection is any indication, the CO detection is probably performs as they say it does.

Another reviewed blasted it because the "voice" was so quiet. For a combo detector under $30 who cares? Are you going to stand under a blasting alarm (it's VERY loud) straining to hear the voice say "fire" or "carbon monoxide"? Or are you just going to get out of the house? The alarm is going off for crying out loud! A fire should be readily apparent. If it's CO you don't want to be in the house anyway.

I hope this style is still around in 10 years when I need to replace this one!
24 people found this helpful
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Jessica H
5.0 out of 5 stars Needed to replace an expired /old smoke detector.
Reviewed in the United States on March 8, 2024
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
This was the same model, just with a cool new feature like the announcements of possible danger.
It’s a bit on the loud side when it does go off, but aside from that, very happy with my purchase.
I’ve had it for 2 months now, no issues.
One person found this helpful
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CAA
5.0 out of 5 stars So easy to pop in!
Reviewed in the United States on December 21, 2023
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
I was replacing the exact same CO2 and fire alarm so I didn’t have to remove the original bracket in the ceiling. This one clicked right in instantly went green and started doing its job!! I would order this again.
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Dannyboy
5.0 out of 5 stars It worked better for me to install battery operated CO/smoke detectors versus hardwiring to system
Reviewed in the United States on February 9, 2016
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
Our home is only 4 years old. Our builder installed 3 hardwired Kidde smoke detectors (i12040) and 2 Kidde CO/Smoke detectors (KN-COSM-1B) within a small radius of our home, which caused unbearable noise when the system lost power one day and all 5 units were alarming. There was no way to shut off the devices, pressing the HUSH button did nothing (by using the end of a broom on the unit on the ceiling). I finally had to get the ladder, twist all 5 devices off the ceiling, unplug it from the wire in the ceiling, and remove the batteries before the noise would shut off. When the power was back on, there were multiple false alarms, twice a day, for the following week. Nothing I did would correct the problem. I read somewhere that the CO detectors have a short life (these were 6 years old), and may have caused the other smoke detectors to malfunction. After spending considerable time trying to find the faulty unit, I decided that all the devices must have malfunctioned due to the power outage. I threw all 5 away.

Instead of hardwiring the 2 CO/Smoke detectors into the existing system, I purchased battery operated ones (KN-COSM-BA). Each unit fit on the already installed base, which made it easier. I like that the 2 AA batteries can be changed from the front of the unit instead of having to twist them off the ceiling. This way, the CO detectors are not hardwired into the rest of the system and will go off only if CO or smoke is detected. Hopefully, this is will eliminate another complete system failure if the power goes off. I always replace the batteries on the first of the year regardless if they need it.

I replaced the 3 hardwired smoke detectors (i12040), each has a 9 volt battery (for backup) that is located on the back of the unit. The unit is then plugged into the ceiling plug onto the back of the unit, and twisted onto the existing plastic base that is mounted on the ceiling. At first the hardwired smoke detectors all flashed with a solid red light every few seconds. I thought that perhaps it was because I did not hardwire the CO/Smoke detectors. Eventually after about 10 minutes the light stopped blinking, and then had the normal quick blink of red every minute or so.
54 people found this helpful
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Top reviews from other countries

Amazon Customer
5.0 out of 5 stars batteries
Reviewed in Canada on June 17, 2020
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
Takes 2AA batteries not 9v which was a pleasant surprise.
2 people found this helpful
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vara
5.0 out of 5 stars intallation
Reviewed in Canada on August 2, 2020
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
all good
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Myk K.
3.0 out of 5 stars Price
Reviewed in Canada on February 21, 2020
Size: 1 PackStyle: Previous ModelPattern Name: DetectorVerified Purchase
Just after It was received, local costco started carrying similar type with built in battery that will last 10 years, pack of two and much cheaper than this one. Item is not returnable.
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