Installing is truly easy since it does not require cutting any wires or altering plugs. Just fit the adapter with plugs to your radio unit (Chorus, Concert, Symphony 2, Navi plus) and your navi is set. The instrument complies to almost all sort of input and car facilities like CD changer, BOSE system, telephone and electric current supply. Compatible with: ALL AUDI A3, A4, A6 models 2001-06 Technical data: 1x ISO power plug, 1x ISO speakers plug, 1x ISO CD-changer, BOSE plug, 1x Quad lock-MOST plug, Tel Mute, Length: approx. 0.2m.Lightinthecars