Auxillary Adapter,Yomikoo Car MP3 3.5mm Interface AdapterAudio Car Digital Music Changer 3.5mm Aux Interface for VW Beetle 1999-2003 Passat 1999-2001 Polo 1999-2004 TS 1999-2002 3.5mm Aux interface for listenning music ,charging jack only for changing (can not listen music) Not work with Navi radio or DVD radio Not work with audi MMI system Not work with Polo 2004 with single-disc CD radios without MP3 function Audi 20pin connector(YT-Audi20)is optional for avoidingmodification on Audi 8pin radios