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Best CO & smoke alarms

Consumer Reports Ratings for Best CO & smoke alarms

Best CO & smoke alarms

We tested 24 co & smoke alarms to determine the best-performing models. Our expert lab technicians tested each CO & smoke alarm based on the following criteria:

  • High CO levels
  • Low CO levels
  • Display/voice

Below lists the CO & smoke alarms that rated best in each of the tests our experts looked for. Learn about how these tests were performed and find out which CO & smoke alarm is rated best when you subscribe.

Consumer Reports Ratings for Best CO & smoke alarms

Best CO & smoke alarm for High CO levels

High CO levels rates a model's response to CO of 300 parts per million.


This CO & smoke alarm which tested best for High CO levels has the following features: Power supply and Hush button.

Best CO & smoke alarm for Low CO levels

Low CO levels rates a model's response to CO of 150 ppm.


This CO & smoke alarm which tested best for Low CO levels has the following features: Power supply and Peak memory.

Best CO & smoke alarm for Display/voice

Display/voice rates the accuracy of the CO level either displayed digitally or conveyed by voice message.


This CO & smoke alarm which tested best for Display/voice has the following features: Power supply and Hush button.