Is my late 2014 Mac able to function with the new smart keyboard and mouse?
Is my late 2014 iMac able to function with a new smart keyboard and a new smart mouse?
iMac
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Both of them are listed as compatible with the late 2014 iMac. See the Compatibility sections of Magic Keyboard - US English - Apple and Magic Mouse - White Multi-Touch Surface - Apple
Also note that both of those articles state that the keyboard article above states that macOS 11.3 or later must be installed.