There are several ways to do this. What do you mean when you say 'without wires'? Do you mean you don't want to remove the existing radio and replace it, thus messing with wires, or do you mean you don't want something that plugs in, and looks messy...?

I installed a DAB in a Ford Focus I had; my husband bought me a very nice one and the blanking plate to go with it, and it was an hour's work to remove the existing radio, install the DAB one and test it out. Little bit of electronics know-how needed (I mean utterly minimal common sense and safety knowledge).