; Mercedes SLK-Class (R171) facelift Original radio options - InCarTec

There are multiple original radio options in the Mercedes SLK-Class (R171) facelift, which option is the original fitted system?

SLK COMAND NTG2 basic audio (no amplifier) SLK COMAND NTG2 basic audio (no amplifier)
SLK COMAND NTG2 with Harman/Kardon audio system SLK COMAND NTG2 with Harman/Kardon audio system
SLK NTG2 Basic audio (no amplifier) SLK NTG2 Basic audio (no amplifier)
SLK NTG2 with Harman/Kardon audio system SLK NTG2 with Harman/Kardon audio system