Model # KN-COPP-3

Internet # 100045210

Store SKU # 201001

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

$43.97 /each
  • Carbon monoxide detector
  • Digital read out
  • Battery back up



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 


Power Source: Plug-In
Brand: Kidde
Price: $30 - $40
Review Rating: 4 & Up


Rated 4.6 out of 5 by 70 reviewers.
Rated 5.0 out of 5.0 by Think it's good...... Got this product because my new house has a ventless gas fireplace. Seems to work fine. It's always been at zero on the gauge the whole time and no one has died. So, I guess all is well. December 8, 2015
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 5.0 out of 5.0 by Replaced expired identical unit Decent unit, more expensive at HD than Amazon but there are stories about outdated units being sold on Amazon. Since they die after 10 years (my original was only good for 7), it was worth a few bucks more getting it from HD. December 22, 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 Safety counts No home should be without a CO alarm or smoke detectors. This CO alarm is efficient and reasonable in price. The battery backup is a plus. We've never had an issue with our previous unit and recently replaced a ten year old unit with a new one, as is recommended. January 12, 2016
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 good monitor Was easy to set up, and I like the fact you can set it on a table or dresser because cord is plenty of long enough to reach location where sitting. December 31, 2015
Rated 5.0 out of 5.0 by Very good product I bought this product to replace my old carbon monoxide sensor which had warn out. It was easy to assemble and install. I like the display which tells how much carbon monoxide is present in the room. December 29, 2015
  • 2016-02-01 T07:27:33.421-06:00
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