This USB 3.2, Gen 1 SD4.0 UHS-II enabled card reader transfers data at rates up to 5 Gbps. Only UHS-II enabled readers can provide the download advantages of UHS-II SD cards. This reader is backward compatible with UHS-I SD cards. This reader will give you those quick downloads you want. A UHS-I Micro SD card slot is also built into each reader. The reader’s small footprint makes transport and storage easy.