What are these wires for?

[neilA4]

Whilst changing the concert h/u over I found these wires? What are they for?
I do have a antenna thing dangling down from the roof inside car? Also a small black thing (microphone???)
Also have a switch or blank missing?

 

[aragorn]

They aint factory, but at a guess from your description i'd say its part of an old handsfree fit?

 

[neilA4]

yes must be hands free kit? The yellow wire is the same as all the other audi ones running through the car? I'll have to trace the wires and see where they go, may make it easier to install a boost gauge lol

 

[rasA4]

just a blank missing