Keychron K8 - Key Functionality Modes; Function vs. Multimedia Keys; Power Saving; Auto Sleep Mode Management

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If you are on the Mac, the default is to press F5 key.
If you are on the Windows, the default is to press fn + F5 key.
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For Siri on Mac: Go to System preferences> Siri >
select the shortcut by pressing Windows key + C key.
*Siri key only works on MacOS and does not work on iOS.
*Windows Cortana is only available for Windows 10 and above OS. Cortana is only
available in certain countries / regions and might not work everywhere.