The Lexar Professional 1667x SDXC™ UHS-II card let you quickly capture and The Lexar Professional 1667x SDXC™ UHS-II card let you quickly capture and transfer high-quality photos, including 1080p Full-HD, 3D, and 4K video, with a read transfer speed up to 250MB/s (1667x). This card leverages UHS-II technology (U3) for high-speed performance. This dramatically accelerates workflow from start to finish. with a read transfer speed up to 250MB/s (1667x). This card leverages UHS-II technology (U3) for high-speed performance. This dramatically accelerates workflow from start to finish.