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Kidde 21008873-2 KN-COPP-B-LPM Battery-Operated Carbon Monoxide Alarm with Digital Display, 2 Pack

by Kidde
4.6 out of 5 stars 1,737 customer reviews
| 7 answered questions
List Price: $45.99
Price: $38.99 & FREE Shipping on orders over $49. Details
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2 Pack
White
  • Enter your model number above to make sure this fits.
  • Large digital backlit display is easy to read, even in low-light conditions
  • Peak-level memory displays the highest co concentration measured since the last reset
  • Meets the requirements of underwriters laboratories (UL)
  • Battery operated with two aa batteries included
› See more product details
10 new from $38.99
$38.99 & FREE Shipping on orders over $49. Details In Stock. Sold by Trademark Supplies 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 .

If you're a seller, Fulfillment by Amazon can help you increase your sales. We invite you to learn more about Fulfillment by Amazon .

Frequently Bought Together

  • Kidde 21008873-2 KN-COPP-B-LPM Battery-Operated Carbon Monoxide Alarm with Digital Display, 2 Pack
  • +
  • Kidde FA110 Multi Purpose Fire Extinguisher 1A10BC, 1 Pack
  • +
  • Kidde KN-COPP-3 Nighthawk Plug-In Carbon Monoxide Alarm with Battery Backup and Digital Display
Total price: $87.85
Buy the selected items together

Special Offers and Product Promotions

Size: 2 Pack | Color: White
  • Working on a home project? Need some help? Check out Amazon Home Services and get a $30 Amazon Gift Card when you book your first service. Learn more

Product Information

Size:2 Pack  |  Color:White

Technical Details

Part Number 21008873-2
Item Weight 1.3 pounds
Product Dimensions 11 x 9 x 3.7 inches
Item model number 21008873-2
Batteries 2 AA batteries required. (included)
Size 2 Pack
Color White
Style 2 Pack
Item Package Quantity 1
Batteries Included? Yes
Batteries Required? Yes

Additional Information

ASIN B00I0BSHB0
Customer Reviews
4.6 out of 5 stars 1,737 customer reviews

4.6 out of 5 stars
Best Sellers Rank #2,212 in Home Improvements (See top 100)
#2 in Home Improvement > Safety & Security > Facility Safety Products > Warning Alarms
#6 in Home Improvement > Safety & Security > Fire Safety > Carbon Monoxide Detectors
#29 in Home Improvement > Safety & Security > Household Sensors & Alarms
Shipping Weight 1.3 pounds (View shipping rates and policies)
Date First Available January 23, 2014

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsSeems to be a quality product
By G. Smith on August 30, 2011
Size: 1 PackColor: White Verified Purchase
I did a lot of reading on all the different type of CO1 detectors offered here on Amazon. I chose this model not only for my own home, but also for the customers I install CO1 units into their homes (I'm a contractor). This is not the cheapest model available and the same company makes one without the digital readout which is less expensive, but I believe it's worth the extra money to have the readout. That way, I feel that if there is a problem, it may be caught sooner than later if the amount of emissions are listed. This unit is guaranteed to last seven years as opposed to the other model without the readout at five years. It's one place I would not want to cut corners. I also prefer the types that are mounted at eye level and not into an outlet.
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5.0 out of 5 starsTested with CO in closed container at varying concentrations. Worked very well!
By Trajork on May 6, 2014
Size: 1 PackColor: White Verified Purchase
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.Read more ›
6 Comments 347 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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5.0 out of 5 starsHelped Save My Life
By Amazon Customer on February 12, 2013
Size: 1 PackColor: White Verified Purchase
I ordered this to verify one (another brand CO detector with meter) I've had went off several weeks ago. The one that I had in the house for more than three years went off and showed around 40 PPM. Since it was over three years old, I thought that it was possibly bad. So I went to Wallmart and bought a cheap CO detector without a meter. I thought I was safe, because the new one never went off. Then I read that it will not alarm until it gets to 50 PPM. I decided to buy this Kidde CO meter. My old CO detector went off again and showed about 30 PPM this time (not as cold outside during this day). I looked at the Kidde and it showed 20PPM (the Kidde alarm did not sound an alarm though). I called 911 and the firemen came to my house and took readings with their meter and showed 19 PPM. They turned off my furnace and the gas. The gas company determined that my forced air gas furnace was blowing CO throughout the house, because the furnace heat ex-changer had holes in it. They said that CO builds up in your body and is potently lethal. I actually feel physically much better now that my furnace is fixed. Sure glad I got the CO detectors WITH a meter.
5 Comments 254 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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4.0 out of 5 starsCompact Size - Easy Installation
By ThroughTheLookingGlass on June 15, 2013
Size: 1 PackColor: White Verified Purchase
I don't have a lot of experience with CO alarms, but my previous one was a Nighthawk model that was considerably bigger that lasted 7 years from date of Manufacture, but I think it was 1/2 that since I had it installed. When it died it displayed "Err" and beeped periodically. It was required to be plugged in with an adapter, and used a 9V Battery backup.

I bought two of these Kidde KM-COPP-B-LPM models as replacements so I could have one on each level. I wanted a battery only operated one so I would have more flexibility in placement of the device, and so it was easier to monitor without messy cords.

Installation was easy, but it would have been nice if they had mentioned a suitable drill-bit size for the plastic anchors to be inserted, not a big deal but they should have done it for the less experienced. On the positive side at least they privided anchors with the screws.

I was most pleasantly surprised with its compact size (uploaded image of it above light-switch panel). The instructions were fairly detailed and easy to read. I like that the unit has a internal timer and after 7 years will let you know it is time to replace unit. I'm a bit confused though because information on the packaging says the End-of-Life appears after 7 years, but a sticker on the unit says it shuts down after 10 years, I believe the instructions talk about the EOL indicator, but never mention a timeframe.

Overall this device was what I was looking for and Amazon offered a 15% discount if you purchased more then 1 unit so that worked out well too. Now I just have to hope for 5 years or more of problem free operation.
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Most Recent Customer Reviews

5.0 out of 5 starsThis is the second Kidde CO sensor I've owned. ...

This is the second Kidde CO sensor I've owned. The former one lasted 7 years. This one is supposed to last ten. At the end of life, the unit beeps.

Published 15 hours ago by emcguy44
5.0 out of 5 starslike having the 2 pack with digital display

Nice to have these in the house. The small cost to have protection against carbon monoxide is well worth it. Read more

Published 1 day ago by nathan m rohda
5.0 out of 5 starsFive Stars

Easy set up love the digital reading.

Published 2 days ago by jenny
5.0 out of 5 starsFive Stars

Great product and works as described

Published 4 days ago by Jim Hammer
5.0 out of 5 starsgreat deal, good stocking stuffers

Just as advertised, great deal, good stocking stuffers!

Published 5 days ago by Jessmom
5.0 out of 5 starsBetter safe than sorry.

For under $20 why not pick one up to put near the furnace or attached garage.

Published 5 days ago by 67beetle
3.0 out of 5 starsThree Stars

Yup a CO monitor.

Published 6 days ago by Amazon Customer
5.0 out of 5 starswho responded said they liked detectors like this that show a level

We purchased this detector about two months ago and it went off today when we had our whole house generator running. Read more

Published 7 days ago by Patricia L. Badeau
1.0 out of 5 starsDied after two months with no warning.

I bought this and within a month one of the units completely died. No battery issue or warning. I change batteries and it never came back on. Thank god I checked it randomly. Read more

Published 7 days ago by Becky Thomas
5.0 out of 5 starsFive Stars

It's perfect and just the right size!

Published 8 days ago by Valerie A. Laubacher

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