This Secure Digital Class 10 memory card is designed to be fast & durable for extensive shooting in extreme environments. Promising minimal transfer rates up to 40MB/s & guaranteed optimal performance for the transfer of images, music & other complex digital data, Delkin Pro SDXC (Secure Digital e Xtended-Capacity) cards are optimized for use in professional grade digital cameras, DSLRs & camcorders. Note: The 64GB SDXC 266X Class 10 Memory Card will only work with SDXC compatible cameras.