How does it work?

We have a schoolproject were we have to redevelop or invent something new. We had the idea to make a little case for the Iphone 7 so it would have a headphone jack 3.5mm. We already have a concept, but the only thing we are missing is the electrical circuit. We are not electrical engineers but we had to work it out. We are not going to make it practical, we just need to do it theoretical. So my question for you is, can you explain how it works or maybe a electric scheme? It doesn't need to be the full one, just a simple one for us, so we can understand it.

Thank you for your attention and time.

Belkin Lightning Audio + Charge Rockstar

Belkin Lightning Audio + Charge Rockstar

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