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Kidde KN-COSMXTR-BA Nighthawk Combination Carbon Monoxide and Smoke Intelligent Alarm

by Kidde
4.3 out of 5 stars 375 customer reviews
| 38 answered questions
List Price: $77.05
Price: $41.99 & FREE Shipping on orders over $49. Details
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Only 1 left in stock.
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Sold by Liquidatech and Fulfilled by Amazon. Gift-wrap available.

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4.869565217391305 stars (23)
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  • Voice alarm, announces hazard type detected helping to speed up correct reaction to hazard detected
  • Combined carbon monoxide and smoke alarm, single unit can be installed instead of two, reducing installation time
  • Test reset button tests alarm circuitry and triggers voice announcement, flashing green and flashing red LEDs
  • Low battery condition announcement initiates alarm chirp and flashing red LED activation
  • Battery powered, provides protection even during power outages
› See more product details
32 new from $40.00 4 used from $20.80
Improve your home in time for spring Improve your home in time for spring

$41.99 & FREE Shipping on orders over $49. Details Only 1 left in stock. Sold by Liquidatech and Fulfilled by Amazon. Gift-wrap available.

Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Something we hope you'll especially enjoy: FBA items qualify for FREE Shipping and .

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Frequently Bought Together

  • Kidde KN-COSMXTR-BA Nighthawk Combination Carbon Monoxide and Smoke Intelligent Alarm
  • +
  • Kidde FA110 Multi Purpose Fire Extinguisher 1A10BC, 1 Pack
  • +
  • Kidde 21005779 Pro 210 Fire Extinguisher, ABC, 160CI
Total price: $95.47
Buy the selected items together

Special Offers and Product Promotions

  • Working on a home project? Need some help? Special One Year Anniversary Offer: Get up to a $60 Amazon Gift Card when you book a service valued at $200 or more. Learn more

Product Information

Technical Details

Part Number GID-106869
Item Weight 1.8 pounds
Product Dimensions 3 x 8 x 12 inches
Origin China
Item model number KN-COSMXTR-BA
Color White
Material Plastic
Power Source battery-powered
Item Package Quantity 1
Batteries Included? Yes
Batteries Required? Yes

Additional Information

ASIN B003Z4JJX2
Customer Reviews
4.3 out of 5 stars 375 customer reviews

4.3 out of 5 stars
Best Sellers Rank #86,538 in Home Improvements (See top 100)
#63 in Home Improvement > Safety & Security > Fire Safety > Combination Smoke & Carbon Monoxide Detectors
#502 in Home Improvement > Safety & Security > Household Sensors & Alarms
#8,842 in Industrial & Scientific > Occupational Health & Safety Products
Shipping Weight 8 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available August 17, 2010

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers
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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsThis thing saved me and my Family's life
By Peter on January 28, 2011
When I first bought my house, a friend of mine recommended replacing all my smoke detectors with smoke and carbon monoxide detectors. Smartly, I took his advise and replaced all of them with these.

A couple years later, one evening, my daughter was in bed and me and my wife was just about to head to bed the Kidde detector starts yelling, "Warning - Carbon Monoxide".

Freaked me out. Got everyone out of the house and called 911. Fire department came out and shut the gas off to the appliances and cleared the house. It turned out to be the gas water heater which needed a little maintenance.

It scares me to think of what could have happened if I didn't have this Smoke/Carbon Monoxide detector.

So, I highly recommend this detector for everyone. Really, just get it...
4 Comments 221 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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5.0 out of 5 starsAn Excellent Combination Life-Safety Alarm that is a Good Choice As A Stand Alone or As Part of A Total Home Safety Alert Plan
By Blair on August 24, 2010
This review is from: Kidde KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm (Tools & Hardware)

I've installed installed two of these Kidde brand combination smoke and carbon monoxide detectors in my elder parents home. I have one in my own home as well and have found them all to be reliable and trouble free.

What attracted me to this model were its many features:

First, it has a low profile, attractive and unobtrusive design.

Second and perhaps most important, it has a voice speaking function that, in addition to the 85db alert horn, will speak out clear warnings: "FIRE, FIRE" or "DANGER: CARBON MONOXIDE". I think that this feature is a terrific addition toward modern life-safety technology. Indeed, you will likely see more voice warning devices in the near future.

We rely on these detectors to warn us, especially at night when we are sleeping. Awakening to this detector from a deep sleep helps orient you quickly by telling you the specific danger -- clearly and unmistakably. Notably, recent studies have shown that children can sleep through traditional smoke detector alarms, but will respond to voice warnings -- which this unit provides. Thus, placed in or near bedrooms this device can be a true lifesaver.

Another favorite feature is ease of installation. It was a breeze and truly could not be simpler. A screwriver is all you need. A small power drill/driver would speed the process, but is not necessary. Two screws into the ceiling or wall and you are done with the mounting bracket. The detector then just clicks in to place with a clockwise flick of the wrist. This is a do-it-yourselfer's dream. It doesn't get any easier!Read more ›
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5.0 out of 5 starsWorks well / Easy to understand / Great battery life
By NLee the Engineer HALL OF FAMETOP 50 REVIEWER on March 20, 2013
I bought a Kidde KN-COSM-XTR-B Nighthawk Combination Carbon Monoxide, Fire, and Smoke Intelligent Alarm last year, since one of my old carbon monoxide alarms started 'chirping' (due to end-of-life). So far the Kidde alarm seems to work really well without any false-alarm. Of course, as with any safety devices, you never know it actually works until something BAD happens. So it is more for "peace of mind" than anything else.

The 'Talking Alarm' feature is a great help because it makes the device so much easier to use than any of my previous detectors. For example, once I inserted three AA batteries, the device goes through the test procedure, by saying
"Testing"
"Fire, Fire"
"Warning, Carbon Monoxide"

As the battery voltage gets too low, the device will actually say "Low battery". That means there's no need to dig up the product manual and struggle to read the tiny prints, in order to understand the meaning between 'long beep' or 'short beeps', and so on.

If you don't have all three AA batteries installed, a safety latch prevents the device to be mounted to the base plate. This is a good safty feature, since it prevents people from simply hanging an alarm on the ceiling without batteries inside.

The battery consumption is very low. I measured 0.10mA in standby. An alkaline AA battery has a rated capacity of around 3000mAh in light load. So a set of 3 AA alkaline cells should last for 30,000 hours, or over 3 years. By the way, all carbon monoxide detectors have a built-in termination date of around 7 years (something to do with the half life of the radioactive isotope in the detector).Read more ›
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4.0 out of 5 starsWorks Great
By M. Scholz on August 30, 2011
Verified Purchase
I am a rental owner and recently purchased these units to comply with the Carbon Monoxide detection mandates. Having read comments from others, I based my purchase decision on the following criteria (in order of importance): accuracy, ease of use for my tenants, and price. I was most worried about false or missed alarms. Reading the reviews, these seemed the most reliable for the price. The ease of use is simple: The voice says "FIRE", it's detected smoke; the voice says "CARBON MONOXIDE", it's detect CO. Given folks may not be thinking clearly in the event of either, it takes the second guessing out of false alarms or why an alarm would alert if there's no smoke. Although a little on the higher side, I thought the price was reasonable given the Amazon discount.

About these detectors: They are operate on 3 AA batteries (recommend changing-out annually) and are extremely easy to install. If you have the least bit of inclination and an cordless drill, I'd recommend you tackle the installation yourself (two anchor screws and you're done). If you don't have a cordless drill, buy-one for a fraction of the cost savings of not paying for them to be installed. Place one unit in each room (I prefer above the doorway) and one on each side of the hallway.

These units are not networked (meaning if one alarms, it doesn't trigger the others). I opted out of getting networked detectors (although it seems like a good idea) based on concerns of false triggers (reports of one or more bad units shipped that set off the entire array of detectors; one guy claimed his tv remote set off his wireless units). I figure the bugs (if any) will be worked out by the time I need replacements.Read more ›
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