1>Super Speed: With USB 2.0 standard protocol, STC USB SD Card Reader allows you to transfer HD movies or large files in just seconds. 2>Read With Ease: Equipped with the powerful chip, UGREEN SD Card Adapter could run your SD/SDHC/SDXC//MMC/RS-MMC/Micro SD/Micro SDXC/Micro SDHC/UHS-I memory cards smoothly. 3>Simultaneous Working: UGREEN USB SD Card Adapter is able to read and write on two cards at the same time, keeping you away from the hassle of constant unplugging and re-plugging.