This adapter is required if your Audi A4, A5, Q5 is equipped with an Audi sound system or if your VW Golf 6 is equipped with a Dynaudio sound system It allows you to integrate the Premium infotainment system for Audi A4 (item number: 41341), A5, Q5 (item number: 41340) or the Alpine style infotainment navigation system for VW Golf 6 (item number: 41346) into the original sound system With this adapter, the more powerful Alpine navigation system complies with the OEM amplifier Suitable for: Audi Sound 9VD or B & O 9VK - Audi A4, A5, Q5 Dynaudio sound system - VW Golf 6 Scope of delivery: adapter