SanDisk Extreme PRO microSDXC UHS-I memory cards now come for uncompromising smartphone, tablet and camera performance. Capture 4K Ultra HD and Full HD videos and enjoy transfer speeds of up to 200MB/s (Up to 200MB/s read speed; up to 90MB/s write speed.) Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. So you can shoot like a pro and still experience world-class responsiveness from your phone. Class 10 and UHS Speed Class 3 (U3) ratings mean your videos can meet today's highest resolution standards.