Originally made for transferring photos and videos from a camera to an iOS device, the Apple Camera Connection Kit (CCK) is essentially a full-size Female USB Type A jack to a Lightning Adapter.
It is, however, a lot more versatile now than just being able to transfer files. You can actively use it to play Digital Music files over an external DAC, bypassing the internal audio processing entirely. This makes it easy to use your favorite iOS device with an external DAC/Amp like an Audioquest Dragonfly, a Chord Mojo, a plethora of iFi Devices and more.
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