The Sony UHS-II series of memory cards maximizes performance of quality and professional UHS-II compatible cameras. With UHSII compatible cameras, max read of 277MB/sec. and max write of 150MB/sec.², providing excellent performance in 4K video shooting and continuous burst mode shooting, with extra-fast transfer. | Sony | | SF-M Series 256GB SDXC UHS-II Memory Card | Black | Best Buy