See also:

USB audio interface/mobile phone audio interface
At a glance It is possible to connect external audio devices. They can be operated via iDrive. The sound is output on the vehicle loudspeakers Connectors for external devices ▷ Connection ...

BMW X6: rear seats
The head restraints in the rear cannot be adjusted and cannot be removed. ...

Before mounting
Before mounting child restraint fixing systems, ensure that the rear seat backrests are locked. ...