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Model # KN-COPP-3

Internet # 100045210

Store SKU # 201001

Plug-In Carbon Monoxide Alarm with Digital Display and 9-Volt Backup

This item has been discontinued.
The Home Depot no longer carries this specific product.

$43.97 /each




Model # KN-COPP-3

Internet # 100045210

Store SKU # 201001

Store SO SKU # 198092

The digital readout of the Kidde Plug-In Digital Carbon Monoxide Alarm with 9-Volt Backup continuously displays carbon monoxide levels from 30 to 999 parts per million (PPM) and will sound an 85 dB alarm when dangerous levels are reached. The carbon monoxide level sensed is continuously displayed and updated every 15 seconds, and the peak level memory shows the highest level of carbon monoxide present since the last time the unit was reset or unplugged. Protection continues during power outages thanks to a 9-volt battery backup.

  • Plug-in carbon monoxide detector with digital readout
  • 85 dB alarm sounds when carbon monoxide reaches dangerous levels so you can protect your family
  • Test/reset button to check for proper operation and reset the unit
  • 9-volt battery backup provides protection during power outages
  • Displays carbon monoxide levels from 30 to 999 PPM
  • Updates digital reading every 15 seconds
  • Peak level memory displays highest carbon monoxide level recorded since previous reset or unplugging
  • Plugs into AC receptacles
  • Note: Product may vary by store
  • Permanent sensor never needs replacement

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Alarm Type 
Carbon Monoxide 
Alarm/Detector Features 
Battery Back-Up,Digital display 
Battery Back-Up 
Commercial / Residential 
Commercial / Residential 
Connector/Contact Type 
Power Source 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 


Rated 4.5 out of 5 by 65 reviewers.
Rated 4.0 out of 5.0 by Easy to use and install Product very user friendly. Very easy to install; basically put the backup battery in and plug it in. Excellent design to rotate the plug to fit the wall outlet. December 10, 2013
Rated 4.0 out of 5.0 by comfort knowing The carbon monoxide alarm reassures the levels are safe in our home. October 20, 2015
Rated 5.0 out of 5.0 by Saved my butt I bought a Nighthawk plug in in 1996. It's now 2012 and I never realized it need to be replaced. OMG, it just went off at 5:00AM this morning. I found that the side venting furnace had a large hole on the top side of the duct due to rust. CM was leaking into the basement and carried up stairs. My wife had complained about headaches, but we never connected the dots until the alarm went off. Needless to say I'm buying 3 more today! Thanks, NH January 23, 2012
Rated 5.0 out of 5.0 by Seems to be working fine. Hopefully it will continue working as well as the previous one did for a long time. September 19, 2015
Rated 5.0 out of 5.0 by very versatile I bought this because of its digital readout and max CO level memory. After reading the directions I realized that it has a built-in power adapter ("wall wart" style) with a long cord neatly stowed in back, which allows this unit to be directly plugged into an outlet, or the adapter can be plugged into any outlet while the main unit is resting on a table top (stand included) or is mounted on a wall at a more comfortable reading height than the outlet is located. January 21, 2014
Rated 5.0 out of 5.0 by It's a life saver It was very easy to plug in to the wall. Everyone should have @ least one, it saved my mother's life a few years ago, when her furnace malfunctioned. October 28, 2014
Rated 5.0 out of 5.0 by A true nighthawk We've had 3 nighthawks and I am purchasing the fourth one. This last one lasted 8 years. We love this product. It never fails. The alarm went off once. And it was due to the gas burner being left on accidentally by someone in the household (could have been me). We leave one upstairs (kitchen) and one downstairs (basement). I personally have encouraged people to buy it and will continue to do so. I am a kidde safety fanatic. We have 3 combo alarms, 2 nighthawks and 2 home fire extinguishers. Can you guess what I do for a living? I am an ER nurse. March 26, 2010
Rated 2.0 out of 5.0 by Built in self destruct I bought two of these and they both lasted almost exactly seven years. I purchased them in Feb of 06 and they both displayed Err messages within a week of each other in Feb of 2013. I called Kidde and they told me that they normally last 7 years and then need replacement. Hard to believe but I need to more. Be aware that I was told that it seven years from production date, the date is on the back of the unit. My alarms were both made in Sept of 03 so they had been on the shelf for three years when I bought them. Make sure they are current year production when you buy yours. March 8, 2013
  • 2015-11-23 T11:01:00.075-06:00
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