The Lexar 64GB SDXC Memory Card Professional Class 10 600x UHS-I. It utilizes UHS-I technology for a super-fast 600x speed rating, allowing for 90MB/s maximum read speed. It's got a Class 10 rating and a maximum write speed of 45MB/s. The card is great for capturing high-quality still photos and 1080p HD video with any SDXC-compatible camera, and satisfies the needs of pro photographers and videographers. Image Rescue 4 software is available via download, enabling you to recover lost or accidentally deleted photo and video files. Also enjoy free professional tech support.