Just do what he should :)

With so an adapter to think first ... OK, why is it so expensive?
That's me, unfortunately, still a mystery, because it really is for the purpose of conversion, in the usual Apple quality, and very good.

I use it for a Y cable because I use in my car which the communication of the navigation device with the iPhone, for the purpose of control, allows via USB and the audio data then passes through 3.5mm jack for standard input.
Unfortunately, there is this cable manufacturer not with the Lightning port.

Therefore, the purchase of the adapter followed.

At this point I would like to mention that although in many forums, and so I think even on the Apple website it was time, circulating the opinion that this adapter from the Lightning on the 30 port no audio data passes on, this is wrong.
He does this correctly, what the use in my car, with the help of the Y cable confirmed.