EAS UHS-II Dual-Slot USB 3.0 Memory Card Reader / Writer (SDXC, SDHC, Micro SD, Black) Supports UHS-II SD Card, which meets the SD4.0 Technology. (with Ultimate W/R Speed of 210Mbps/250mbps on Toshiba SD4.0 Memory Card tested. Different OS test might be different). Supports SD, SDHC and SDXC memory card, mini SD memory cards with an adapter (not included), micro SD(T-Flash) Supports Secure Digital v1.0/v1.1/v2.0/v3.0(UHS-I)/v4.0(UHS-II)| SDHC|SDXC Standards Supports Usb3.0 / Usb2.0 / Usb1.0 Standards & Requests no Driver-Installation Requests no External Power Supply. Supports On-the-Go via OTG Cable (OTG Cable not included)