A carbon monoxide detector, often known as a CO alarm, is an important safety equipment for both tenants and homeowners. Without one, you risk exposing yourself and your loved ones to accidental CO poisoning, which kills over 400 Americans each year, according to the Centers for Disease Control and Prevention (CDC). Carbon monoxide detectors are sometimes (but not usually) incorporated into smoke detectors, so you may already have one at home. If you don’t already have one, they’re inexpensive and simple to set up. 

Best Price: First Warning CO400 Battery-Operated Carbon Monoxide Detector Flexible placement choices First Alert CO400 Battery-Operated Carbon Monoxide Detector

Important characteristics

  • 85dB audio alarm
  • Simple, easy-to-monitor design

What We Dislike

  • Only a 5-year warranty is provided.

A low-cost carbon monoxide alarm is a minor investment in peace of mind. A simple type, such as the First Alert CO400, costs less than $25 and continually monitors for dangerous levels of carbon monoxide, sounding an alert if such a situation develops. A flashing LED, in addition to the auditory 85-decibel alert, serves as a visual signal of danger.

The electrochemical sensor of the First Alert Battery-Operated Carbon Monoxide Detector is a tried and true method of detection.

Because the device is solely powered by a 9-volt battery, you are not restricted in where you may install the carbon monoxide detector due to outlet proximity or electrical wire connections. 

While this device is a fantastic bargain, it needs to be updated every 5 years, whilst some other versions have a 10-year life expectancy. A low-battery buzzer and an end-of-life signal chirp fill out the characteristics of this modest gadget.

Kidde Smoke & Carbon Monoxide Detector is the best pack option

This battery-powered gadget detects smoke and carbon monoxide. The gadget is UL-certified, has a test/hush button, and comes with a 10-year limited guarantee. It’s also available in bigger packs of two, four, and six, enabling you to replace all of your detectors at once.

Important Characteristics

  • Detection of smoke and carbon monoxide
  • Auditory warnings
  • Battery-powered construction
  • a ten-year warranty

Google Nest Protect 2nd Generation Smartest

Battery-operated Nest Protect Smoke and Carbon Monoxide Alarm (2nd gen)

Important characteristics

  • Battery or hardwired?
  • Alarms, both audible and spoken
  • Battery level monitoring and self-testing
  • Aesthetic design that is appealing

What We Dislike

  • Only a two-year warranty
  • 6 AA batteries are required

A smart carbon monoxide detector works in conjunction with your current smart home setup to keep you informed and safe. Google’s renowned Nest smart home ecosystem includes a simple carbon monoxide detector that monitors for harmful levels while alerting to smoke from smoldering fires or flames. 

It’s smart enough to warn you about low amounts of smoke (from high-heat cooking) without sounding the alarm. Nest Protect alarms may be silenced using the app, offering you convenience and control on your smartphone.

The Nest Protect is meant to test its batteries and sensors more than 400 times each day in silence. It checks the audible alarm functionalities once a month by sounding the unit’s speaker and horn. Each night before bed, the light ring around the center of the device turns green to show that the battery level is adequate and that you will not be woken up by an annoying low-battery alert.

Important characteristics

  • Extremely precise
  • Alarms and fast reading
  • Very simple to use


  • Pricey
  • Batteries do not last very long.

With a weight of about two ounces, this ultralight, portable carbon monoxide detector is ideal for bringing with you on the road. You may use it to check for exhaust leaks in your automobile or aircraft, or you can just take it with you on excursions or for fast checks around the house. It detects carbon monoxide levels as low as nine parts per million (ppm), which is substantially lower than the detection threshold of conventional residential detectors.

Man installing smoke or carbon monoxide detector


Because carbon monoxide is colorless, odorless, and tasteless, you may not realize you’re being exposed to it until it’s nearly too late,” Roydhouse continues.

Consider the cost, battery life, simplicity of use, and accuracy when shopping for a carbon monoxide detector. We looked at hundreds of carbon monoxide detectors and rated them based on their price, battery life, accuracy, simplicity of use, and extra features.

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