The SanDisk Extreme SD-UHS-I memory card saves valuable time when transferring media files with a reading speed of up to 170 MB/s thanks to Sandisk QuickFlow technology. In combination with the Sandisk Professional Pro reader for SD and microSD cards, you can reach the maximum speed (available separately). With recording speeds of up to 80 MB/s and UHS Speed Class 3 (U3) 2, they succeed in high-resolution, loss-free 4K UHD video recordings.