SanDisk Extreme Pro SDXC 128GB; Secure Digital Card SDXC; Class 10 & UHS Class 3 (U3) rating; Performance/speed: Up to 170 MB/s read speed, up to 90 MB/s write speed; 4K Ultra HD-ready, Built-in write-protect switch prevents accidental data loss; recommended for Multitrackrecorders, DSLR and Video Cameras