Kidde KN-COB-B Review – Carbon Monoxide Alarm with Electrochemical Sensor

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Carbon Monoxide (CO) is known as one of the silent killer in U.S as it is often tasteless, smell-less and invisible. That is the reason why many people install a CO detector at home/office to monitor the CO level and reduce the risk of CO poisoning. The Kidde KN-COB-B Battery-Operated Basic Carbon Monoxide Alarm with Electrochemical Sensor is specially design to protect you from CO exposure and alert you when detect abnormal level of CO in your premises.

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  • Easy-to-install
  • 5 years warranty
  • Only use 3 “AA” batteries
  • UL approved


  • NA


Kidde KN-COB-B CO detector just power by 3 AA batteries. The battery loading door is at the front of the device, so it makes the battery replacement easy and fast. The advantage of using battery powered device is you are assured you are given protection even during power outage.

Kidde KN-COB-B use a patented Nighthawk electrochemical carbon monoxide sensor , it can detect the CO levels in the air easily and alert the danger by giving a loud alarm.

Kidde KN-COB-B use different LED light as indicator. If you see a green LED light flashing in front of the DO detector it mean it is ON and functioning properly. If Kidde KN-COB-B detected a dangerous level of carbon monoxide in the air, the red LED light will pulse and trigger an alarm sound until the device is manually reset or CO level is reduced. It has a test reset function which you can use to do a test to confirm the CO detector is working properly.

Kidde KN-COB-B Review

UL (Underwriters Laboratories) is an stand-alone society that works on safety standards, it test every safety product to make sure it is compliance with international safety standard. The Kidde KN-COB-B is approved by UL and the manufacturer Kidde is also providing 5 years warranty for the device.

As a requirement of UL 2034, the Kidde KN-COB-B CO sensor will not alarm to levels of CO below 30 ppm and will alarm in the following time range when exposed to the corresponding levels of CO :

  • 70 ppm CO Concentration 60 – 240 minutes
  • 150 ppm CO Concentration 10 – 50 minutes
  • 400 ppm CO Concentration 4 – 15 minutes

The Kidde KN-COB-B carbon monoxide detector is tested to have at least 7 years life, you should replace it after 7 years of operation. Having a unit of carbon monoxide at home can protect you from the dangerous of CO exposure, you can find out more about the features and benefits of Kidde KN-COB-B carbon monoxide alarm HERE.

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