Aux Adapter,Yomikoo Car MP3 3.5mm Interface Adapter AUX in Input for VW 8Pin Audi A2 1999-2005 A3 2001-2006 Beetle 1999-2008 Cabrio 1998-2001 Skoda Superb 2003-2008 Leon 2000-2005 3.5mm Aux interface for listenning music ,charge interface 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