🚨 Breathe Easy with Kidde - Your Safety Companion!
MEMORY MATTERS - Peak Level Memory records past CO detection events.
TEST WITH EASE - Test-Hush button for quick checks and low battery silence.
WORRY FREE WARRANTY - 10-Year limited warranty for long-lasting protection.
PORTABLE PEACE OF MIND - Compact design for easy placement anywhere in your home.
STAY SAFE STAY SMART - Electrochemical sensor technology for precise CO detection.
The Kidde Carbon Monoxide Detector is a battery-powered alarm featuring advanced electrochemical sensor technology. It operates on 2 AA batteries, ensuring functionality even during power failures. With a compact design, it can be easily installed on walls or placed on tables. The device includes a loud 85-decibel alarm, LED indicators for power and CO presence, and a Peak Level Memory feature to track past CO events. Plus, it comes with a 10-year limited warranty for added peace of mind.
Specifications
Brand
Kidde
Power Source
Battery Powered
Color
Detector
Product Dimensions
1.5"D x 4.5"W x 2.75"H
Item Weight
9.28 ounces
Alarm
Audible
Operating Humidity
5% to 95% relative humidity, non-condensing
Upper Temperature Rating
37.8 Degrees Celsius
Sensor Type
Electrochemical
Global Trade Identification Number
00047871088737
Number of Items
1
Manufacturer
Kidde Safety
UPC
785983912532 716080045267 047871088737
Part Number
21008873
Item Weight
9.3 ounces
Country of Origin
China
Item model number
KN-COPP-B-LPM
Batteries
3 AA batteries required. (included)
Is Discontinued By Manufacturer
No
Size
KN-COPP-B-LPM
Pattern
Detector
Voltage
3 Volts
Item Package Quantity
1
Special Features
Portable
Included Components
Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-Copp-B-LPM
Batteries Included?
Yes
Batteries Required?
Yes
Battery Cell Type
Alkaline
Warranty Description
10 Year Limited
Have a Question? See What Others Asked
How is the unit mounted? Should it be near the ceiling or near the floor?
how is it installed
Can the alarm be run with rechargeable NiMH batteries?
is it a plug in
Reviews
4.7
All from verified purchases
D**7
Ten years of trouble free service
I purchased the Kidde Carbon Monoxide Alarm ten years ago, and today, it reminded me of its reliability with a loud, audible chirp and a display reading "END," indicating that it has reached the end of its useful life. Over the years, this unit has proven to be incredibly accurate and dependable, providing me with peace of mind regarding my family's safety. It is long overdue that I write this review.One of the standout features of this alarm is the ease of replacing the batteries when needed. It’s a simple process that ensures the unit remains functional without any hassle. I appreciate how straightforward it is to maintain, allowing me to focus on what truly matters—keeping my home safe.Given my positive experience, I will definitely be purchasing another Kidde Carbon Monoxide Alarm to continue enjoying worry-free living for another ten years. Highly recommend this product for anyone looking for a reliable and user-friendly carbon monoxide alarm!
W**N
Works Well, But Read the Fine Print!
Attractive; Easy to Activate; Detects and Alarms Appropriately.I always read the 1 star reviews before buying a product. Some disturbing comments were: "batteries are impossible to insert" -- I had no trouble inserting the batteries (fit firmly but install with gentle pressure); "Tested with CO and got NO Audible Alarm" -- this was a big red flag, so I tested my unit upon activation. At 500+ ppm CO got good LED visible readout, but NO audible alarm. Was ready to repackage and return, but re-read the product information sheet: "This alarm measures the exposure to carbon monoxide over time; it is designed to sound at 85 decibels at 10 feet when it detects 70 ppm (parts per million) of CO for 60 to 240 minutes, 150 ppm for 10 to 50 minutes, or 400 ppm for 4 to 15 minutes." I retested, exposing unit to 400-650 ppm CO and got an audible alarm at around 6 minutes. Removal from source, display returned to zero and audible alarm ceased. Much more assured that the unit works properly. And Audible Alarm times are well within guidelines for exposure to CO and symptom development (see photo). Also really like that I can replace batteries. Previous units with sealed batteries didn't last anywhere near the 10 year "useable life" advertised.
D**Y
Great Little Alarm
Great monitor at a fair price. Especially like the ability to see a constant ppm level and an easy test function. I use mine in the garage but it could be mounted anywhere. The alarm is plenty loud so it should have no issues alerting even over the loud engine noises.
T**S
May not last 10 years. Check the batteries every year.
Placed in key spots up & downstairs. I use separate smoke alarms. One downstairs, one in hall upstairs and one each bedroom. I know over-kill. My son is a fireman! Batteries went dead in Co2 detector's in two years. Wrote when the batteries were replaced on the back cover. A hint. Used better batteries lasted 5 years then gave up the ghost. Over-all, good product but not a ten year life. Meets all local requirements. Better safe than sorry.
J**N
East to install and read the digital display
Arrived on time and in good condition. Add batteries and mount to wall. Easy peasy. I bought 2 and installed 1 on main level and 1 in lower level about a month ago, and the readout on both is 0, so that is great. Would buy from them again.
T**K
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.
M**E
Performs as advertised
I originally purchased 2 of these units on 2/18/2015. Yesterday, 3/10/2025, one of the units started chirping every 30 seconds. The display read "END", meaning that the detector has expired, and will no longer work. The instructions explain that these detectors have a 10 year life span. No complaints here! I am about to order 2 exact replacements, as I expect the second unit to expire soon. I mount one in the basement and one in the hallway outside the master bedroom.I highly recommend this product.
Common Questions
Trustpilot
TrustScore 4.5 | 7,300+ reviews
Suresh K.
Very impressed with the quality and fast delivery. Will shop here again.
4 days ago
Zainab N.
Fantastic and great service. Shipping was faster than expected.
Kidde KN-COPP-B-LPM Battery-Operated Carbon Monoxide Alarm w/ Digital Display - Digital screen with large display is easy to read - Peak-level memory displays the highest CO concentration measured since the last reset - Meets the all UL requirements - Battery operated with three AA batteries included - Backed by a five-year warranty The new Kidde KN-COPP--LPM carbon monoxide alarm is the only battery-operated alarm that includes a digital display feature. This key feature adds an advanced level of protection that you have come to expect in a Kidde manufactured product. The battery operated CO alarm includes multiple mounting options, allowing installation on a wall or tabletop. This alarm has been carefully designed and tested to detect CO concentration in a residential environment. It provides continuous monitoring of CO levels, even during power outages when many CO incidents occur. The digital display feature allows for easy viewing of carbon monoxide levels from 30-999 PPM (parts per million). The KN-COPP-LPM will also detect and store concentration CO levels as low as 11 and up to 999 PPM with its peak level memory display. This alarm includes a snap-on cover that gives immediate access to the batteries and a safety feature that makes it difficult to close the cover without the batteries being installed. Updates digital reading every 15 seconds, allowing you to see if levels change. The peak level memory displays the highest CO concentration measured since the last reset. The test/reset button tests CO alarm circuit operation and allows you to immediately silence the alarm. A low battery signal alerts users when the batteries need to be replaced. Includes informative LEDs: green LED for normal operation, red LED for alarm. The alarm alerts user to replace CO alarm after 7 years of operation.
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Over the years, this unit has proven to be incredibly accurate and dependable, providing me with peace of mind regarding my family's safety. It is long overdue that I write this review.One of the standout features of this alarm is the ease of replacing the batteries when needed. It’s a simple process that ensures the unit remains functional without any hassle. I appreciate how straightforward it is to maintain, allowing me to focus on what truly matters—keeping my home safe.Given my positive experience, I will definitely be purchasing another Kidde Carbon Monoxide Alarm to continue enjoying worry-free living for another ten years. Highly recommend this product for anyone looking for a reliable and user-friendly carbon monoxide alarm!"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"W***N"},"datePublished":"July 16, 2024","name":"Works Well, But Read the Fine Print!","reviewBody":"Attractive; Easy to Activate; Detects and Alarms Appropriately.I always read the 1 star reviews before buying a product. Some disturbing comments were: \"batteries are impossible to insert\" -- I had no trouble inserting the batteries (fit firmly but install with gentle pressure); \"Tested with CO and got NO Audible Alarm\" -- this was a big red flag, so I tested my unit upon activation. At 500+ ppm CO got good LED visible readout, but NO audible alarm. Was ready to repackage and return, but re-read the product information sheet: \"This alarm measures the exposure to carbon monoxide over time; it is designed to sound at 85 decibels at 10 feet when it detects 70 ppm (parts per million) of CO for 60 to 240 minutes, 150 ppm for 10 to 50 minutes, or 400 ppm for 4 to 15 minutes.\" I retested, exposing unit to 400-650 ppm CO and got an audible alarm at around 6 minutes. Removal from source, display returned to zero and audible alarm ceased. Much more assured that the unit works properly. And Audible Alarm times are well within guidelines for exposure to CO and symptom development (see photo). Also really like that I can replace batteries. Previous units with sealed batteries didn't last anywhere near the 10 year \"useable life\" advertised."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"D***Y"},"datePublished":"March 23, 2025","name":"Great Little Alarm","reviewBody":"Great monitor at a fair price. Especially like the ability to see a constant ppm level and an easy test function. I use mine in the garage but it could be mounted anywhere. The alarm is plenty loud so it should have no issues alerting even over the loud engine noises."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"4.0"},"author":{"@type":"Person","name":"T***S"},"datePublished":"April 10, 2025","name":"May not last 10 years. Check the batteries every year.","reviewBody":"Placed in key spots up & downstairs. I use separate smoke alarms. One downstairs, one in hall upstairs and one each bedroom. I know over-kill. My son is a fireman! Batteries went dead in Co2 detector's in two years. Wrote when the batteries were replaced on the back cover. A hint. Used better batteries lasted 5 years then gave up the ghost. Over-all, good product but not a ten year life. Meets all local requirements. Better safe than sorry."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"J***N"},"datePublished":"April 18, 2025","name":"East to install and read the digital display","reviewBody":"Arrived on time and in good condition. Add batteries and mount to wall. Easy peasy. I bought 2 and installed 1 on main level and 1 in lower level about a month ago, and the readout on both is 0, so that is great. Would buy from them again."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"T***K"},"datePublished":"May 7, 2014","name":"Tested with CO in closed container at varying concentrations. Worked very well!","reviewBody":"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."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"M***E"},"datePublished":"March 11, 2025","name":"Performs as advertised","reviewBody":"I originally purchased 2 of these units on 2/18/2015. Yesterday, 3/10/2025, one of the units started chirping every 30 seconds. The display read \"END\", meaning that the detector has expired, and will no longer work. The instructions explain that these detectors have a 10 year life span. No complaints here! I am about to order 2 exact replacements, as I expect the second unit to expire soon. I mount one in the basement and one in the hallway outside the master bedroom.I highly recommend this product."}],"aggregateRating":{"@type":"AggregateRating","ratingValue":4.857142857142857,"bestRating":5,"ratingCount":7}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"How is the unit mounted? Should it be near the ceiling or near the floor?","acceptedAnswer":{"@type":"Answer","text":"After spending 40+ years in the car business I have this to say: (everyone seems to be telling what they did or didn't do for a living 😉) I have that if you mount them from one foot above the floor, to one below the ceiling, or even on it..it is still better to have one than NOT to have one! No matter where it is!!\n It's like ANY tester or alarm, if you don't have one..that's when it will get you killed. Either way, most people will end up mounting them where they are out of sight. No matter what the papers or anyone tells you. \nPut at least one on each floor..and pray you never need them. Simple as that!\n Oh..the 40+ years in the car business Taught me this!l, Any idea how much CO is put out into the air of a car dealership over the course of each day, working on from 20-200 cars a day? A LOT! So again, mount it anyplace..but just MOUNT it!\n Good luck to you all. ;)"}},{"@type":"Question","name":"how is it installed","acceptedAnswer":{"@type":"Answer","text":"There is no installation required. Just put in the batteries as shown and it's ready to go. I move mine from room to room. You can mount it on a wall if you want."}},{"@type":"Question","name":"Can the alarm be run with rechargeable NiMH batteries?","acceptedAnswer":{"@type":"Answer","text":"The User's Guide for this product, and stamped on the item itself, are model numbers of alkalines, (Duracell MN1500 or MX1500; Energizer E91, etc). However, it does say \"Use of a different battery may have a detrimental effect on the alarm operation.\" Thank you for calling my attention to this, because the rechargeables I use are NiMH. The item comes with batteries."}},{"@type":"Question","name":"is it a plug in","acceptedAnswer":{"@type":"Answer","text":"This is not a plug-in. Operates on 3 AA batteries and acan be easily mounted on wall. Love it."}}]}]}