For three times cheaper with the addition, an SD card 16gb Transcend, I was not sure of the compatibility and results. On a 2007 Mercedes S-Class with Comand NTG3, I have had no problems. After inserting the SD card (only downside: no benchmark to know in which direction it should be put, especially not to force, in a good way, it goes to the bottom and there is a hook to click ). The PCMCIA adapter is inserted into the audio system of the car, (I spotted the direction of insertion of the SD card) and then everything works correctly: displays the folder tree (I n ' I put only one level: a file by album in which MP3 titles, folder names display tracks on the album, song title, artist (ID Tag3) For now, I have more. 2000 MP3 songs on 16 GB of SD card and there is still space. I am very satisfied !!!! And thank you to Glück-express for having unearthed this product that offers an economical alternative to Mercedes product (Adapter without PCMCIA card 100 !!!) and that works very well for the moment.