Pro performance of up to 100MB/s read and 90MB/s write**, for faster transfer and capture For AndroidTM smartphones and tablets and interchangeable-lens cameras. Records 4K UHD and Full HD video. A1-rated for faster app performance. Shock, temperature, water, and X-ray proof **Note: Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1, 000, 000 bytes.