I did not need 54: 1 Multi Something, but a SD card reader to transfer the tunes from the PC in the car or there play from SD. As someone already wrote here. He seems smaller on the screen, but no loading is ****** SD cards are stop times "large" and because the design is ok for me. Transmission speed I had on USB3.0 only as 12 MB / sec, but this may be due to the old 4GB card. I do not mind. Product appears stable and had no problem with it.