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“Compatible” describes whether it works. “Required” or “Useful” describes whether you should buy it.
JETech
JETech specifies this cable for the Apple 30-pin dock connector on iPhone 4 and iPhone 4s.
This is for the legacy 30-pin dock connector only; it does not fit Lightning or USB-C iPhones.
KabelDirekt
KabelDirekt specifies the 30-pin end for iPhone 4/4s and a USB-C host or adapter connection.
This is for the legacy 30-pin dock connector only; confirm the USB-C power source supports standard USB charging.
Open the evidence, limitations, and model identity for a single accessory.