1. Simple to install, just plug and play, no complex tools required. 2. Supports bluetooth 5.0, low power consumption, reliable to use. 3. Used for wireless transmission of music, navigation, for and phone, etc. 4. Button control on radio/steering wheel for easy operation. 5. Select play on the radio and it start playing automatically. If you change it, it stop playing. Condition: Item Type: Audio Adapter Fitment: Fits for A2 1999-2005 Fits for A3 2001-2006 Fits for A4/S4 1998-2006 Fits for A6/S6 2001-2004 Fits for A8/S8 1999-2003 Fits for AllRoad 2000-2005 Fits for TT 1999-2005 Fits for: Chorus 1, Chorus 2, Concert 1,Concert 2, Symphony 1, Symphony 2, Navigation Plus 1 (non MMI),Navigation Plus 2 (non MMI),(excluding CC),etc (2) Connect the blue head to the rear interface of the CD player, and connect the small coil to the power cord of the CD player! Color: As Shown Material: ABS Package Contents: 1 x Audio Adapter 1 x 20pin Data Cable 2 x Wrench Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.