Impeccable in the COMAND module of a MERCEDES GLK 320 4matic 2009! The original map has been "lost" by the seller, I was forced to replace him. This adapter receives all types of SD cards and the system reads MP3 without problems. Simple, cheap, the remaining portion being visible black, all remains quiet. Last but not least, SD cards can be output and / or inserted without ejecting the PCMCIA card