The Ecoey FJ128 is part of the Smoke & Carbon Monoxide Detectors test program at Consumer Reports. In our lab tests, Carbon Monoxide Detectors models like the FJ128 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.