Anker 8-in-1 USB 3.0 Portable Card Reader for SDXC, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SD, Micro SDHC Card and UHS-I Cards Simultaneously read and write on two cards to save yourself the effort of constant unplugging and re-plugging. USB 3.0 enables data transfer rates of up to 5Gbps for faster Sync times, backward compatible with USB 2.0/ 1.1. Fully powered via your USB port  no additional power supply required. No drivers required for Windows 10/ 8/ 7/ Vista or Mac OS X 10.2 and above. Package Contents: Anker SD/TF card reader, Welcome Guide, hassle-free 18-month .