Designed for quickly offloading high-quality 4K and 5.3K video, high-end photography, and other media from SD Express cards, the PRO-READER SD Express Dual Card Reader from SanDisk features one dedicated SDXC card slot and one dedicated microSDXC card slot, both of which not only support SD Express, but are backward compatible with UHS-II and UHS-I. Using its USB-C 3.2 Gen 2 interface, it may be used as a standalone card reader with compatible Windows and Mac systems. Or, it may also be used within one of the bays of SanDisk Professional's PRO-DOCK 4 for simultaneous offloading, editing, and archiving.