The SanDisk Ultra microSD UHS-I card gives you the freedom to shoot, save and Share more than ever before. It is perfect for recording and watching full HD video, (2) with room for even more hours of video. Transfer speeds of up to 100MB/s help you move all your content blazingly fast-up to 1000 photos in just one minute. (6) Ideal for Android-based smartphones and tablets, this card?s A1 rating means that you can load apps faster too. (1) And, with capacities up to 512GB capacity, this card lets you capture and store more than ever before. | 1GB=1,000,000,000 bytes. Actual user storage less. | [For 64GB-512GB] Up to 100MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. [For 16GB-32GB] Up to 98MB/s read speed; write speed lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. | (1) A1 performance is 1500 read IOPS, 500 write IOPS. Based on internal testing. Results may vary based on host device, app type and other factors. | (2) Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors. See official SanDisk website. | (3) Card only. See official SanDisk website. | (5) Download and installation required. See official SanDisk website. | (6) Based on 4.1GB transfer of photos (Average file 3.5MB) with USB 3.0 reader. Results may vary based on host device, file attributes and other factors.