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    Smoke & Carbon Monoxide Detectors

    First Alert OneLink CO511B carbon monoxide detector

    This model was tested by our experts.

    About

    The First Alert OneLink CO511B is part of the Smoke & Carbon Monoxide Detectors test program at Consumer Reports. In our lab tests, Smoke & Carbon Monoxide Detectors models like the OneLink CO511B 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.

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

    Specs

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