SD or Micro SD cards only work individually. I tried a Transcend 95MB/s card with this card reader connected to USB 3.0 on my computer, the transfer rate was 35MB/s. Entry and exit ALL ports insert easily and without resistance. USB 3.0 ports work. I didn't test the speed though. The attached cable is twisted inside the box body. Lightweight, feels cheap which is ok for the price. USB ports are not recognized by Windows after 4 times use even if the SD card slot is still reading the SD card. Returned
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