The Cook-Key® is designed to function optimally when connected to a 2G network, specifically utilizing a 2.4 GHz connection. This frequency band is more suitable for the device, ensuring reliable connectivity and performance. In contrast, a 5G network, which operates on a 5 GHz frequency, is not compatible with the Cook-Key®. Therefore, users should ensure that they are connected to a 2G network to fully leverage the capabilities of the Cook-Key® and avoid any potential connectivity issues.