This Sony SF-G Series UHS-II 64GB SD Memory Card is an incredibly fast memory card from Sony. It is the one to get if you use a UHS-II device, or ever plan to. It's backwards compatible with UHS-1 cameras, so it's a great future-proof card to get today. In UHS-II devices you get an amazing 300MB/s transfer speed and up to 2999MB/s write speed. Get those RAW pics and 4K video onto the card fast so you have no delay in shooting. High Speed The high performance Sony UHS-II SF-G series of SD memory cards sets new benchmarks for speed: up to 300MB/s Read, 299MB/s Write when used in UHS-II compatible mid/hi-end digital cameras. It is excellent for burst shooting, 4K video shooting, shortening transfer time copying. It is also backward compatible with UHS-I equipment, with up to 95MB/s Read and 90MB/s Write speeds. Fast File Transfer The Sony SF-G Series UHS-II 64GB SD Memory Card has up to 300 MB/s transfer speed and up to 299MB/s write speed. It's UHS-II, Class 10, U3 compliant. Its fast writing speed is excellent for 4K recording and continuous burst mode shooting. Backward Compatible with UHS-I Compatible Equipment While this memory card's highest performance is obtained using a UHS-II compatible camera, users can also use these new cards in UHS-I compatible equipment with high performance (up to 95MB/s Transfer and 90MB/s Writing speeds). File Rescue Downloadable Software File Rescue software recovers files in XAVC S format taken by Sony digital imaging devices, up to 4K RAW image and MOV files. It also recovers Sony/Nikon DSLR AVCHD format up to full HD 60p, and other types of files. High Reliability Protective features include waterproof, dust-proof, temperature proof, UV guard and Anti-static.