How to use an old iMac as an external display for a MacBook via wifi? - Ask Different
Amazon.com: Hagibis iMac Hub with USB C 3.1, USB 3.0 Ports and SD/Micro SD Card Reader, USB-C Clamp Hub USB C Docking Station for 2021 iMac 24 inch (Without HDMI) : Electronics
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USB-C Clamp Hub – USB-C Data Port, USB-A 3.0 Data, Micro/SD Card Reader – Compatible with Apple Studio Display and 2021 iMac 24-inch. Does Not Fit 2020 iMac and Earlier Models (Silver) -