See also:

Tone
Only treble and bass can be set in the rear. The settings are made separately for the left and right headphones. Operation is the same as for the front tone. ...

Maintenance
The battery is maintenance-free, i.e., the electrolyte will last for the life of the battery. Your service center will be glad to advise you on questions regarding the battery. ...

X3 in the Market
As you can probably guess by now, the market has caught up with and in many ways passed the X3. That said, if it weren't for BMW's initiative, this segment might not even exist today, let alone of ...