The First Alert CO615 is part of the CO & smoke alarm test program at Consumer Reports. In our lab tests, Carbon monoxide alarm models like the CO615 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.
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