ISO HARNESS ADAPTER FITS A3 - 2005 - 2012 A4 - 2005 - 2015 TT - 2006 - 2014 A6 - 2004 - 2011 HALF AMP SYSTEM QUADLOCK FAKRA Description This adapter is required when replacing your factory fitted radio with an aftermarket radio. It will convert the original vehicle power & speaker wiring connectors