E46 Specific Board Monitor (BMBT):

5 inch display (320 X 234 pixel resolution)
Uses on screen soft keys for telephone send/end functions. E38/E39 uses buttons.
Does not include auxiliary ventilation function (not a function of E46 BC/IHKA).
Provides display and control functions for the Audio System (radio, cassette and CD).
Provides display and control functions for systems in the menu display.

Fig 1: Identifying E46 Specific Board Monitor (BMBT)
Courtesy of BMW OF NORTH AMERICA, INC.