Smoke & Carbon Monoxide Detectors

The First Alert OneLink CO511B is part of the Smoke & Carbon Monoxide Detectors test program at Consumer Reports. In our lab tests, 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 400 parts per million.

Low CO levels Low CO levels rates a model's response to CO of 100 ppm.

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