This model was tested by our experts.
The Kidde Nighthawk KN-COPP-3 is part of the CO & smoke alarm test program at Consumer Reports. In our lab tests, Carbon monoxide alarm models like the Nighthawk KN-COPP-3 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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