Discover SanDisk's fastest SD Express card reader, designed for offloading high-quality 4K and 5.3K video recording*, high-end photography, and other media from the SD Express card to working drives. Featuring one SD Express slot and one microSDTM Express slot, this portable reader offers easy in-field ingest and backup, compatibility with the SanDisk® Professional PRO-DOCK 4**, and supports your SD and microSDTM UHS-I cards . (*Compatible device required. Full HD (1920x1080), 4K (4096x2160) and 5.3K (5312x2988) video support may vary based upon host device, file attributes and other factors.)(** SanDisk SD Express SD Card, SanDisk microSD Express card and SanDisk Professional PRO-DOCK 4 sold separately.)