BMW 2010 X5 Owner's Manual page 188

Information on connection
> The connected audio device is supplied
with a current of max. 500 mA, if the device
supports this. Therefore, do not connect
the device to the power socket in the vehi-
cle.
> Do not use force when plugging the con-
nector into the USB interface.
> Do not connect any devices, e.g. fans or
lamps, to the USB audio interface.
> Do not connect USB hard disks.
> Do not use the USB audio interface to
recharge external devices.
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