Price $129.00

This model was tested by our experts.

Recall notice

On April 3, Nest Labs halted sales of the Nest Protect smoke and CO alarm and deactivated the hush feature, called the Nest Wave, over concerns that the alarm could be unintentionally deactivated. Read our full report. In May 2014, Nest Labs recalled 440,000 Nest Protect Smoke + CO Alarms because activity near the product during a fire can prevent the alarm from immediately sounding when the Nest Wave feature is enabled. For more details read the recall notice from the Consumer Products Safety Commission.

Ratings, Reviews, Reliability & Compare are for Subscribers Only


The nest Protect 05A is part of the CO & smoke alarm test program at Consumer Reports. In our lab tests, Carbon monoxide alarm models like the Protect 05A are rated on multiple criteria, such as those listed below.

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

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


Power supply Power supply The power source of the model. Some have backup batteries (indicated by BB).
Peak memory Peak memory Indicates whether a model shows peak levels that have occurred.

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