Securedigital sd sdxc card memory size 64 gb read speed 285 mbs write speed 180 mbs bus interface uhs ii memory type mlc file format exfat operating voltage 27 36 v series transcend ultimate suitable for 360 recording sports photography full hd recording 3d recording 4k recording device class digital camera dslr camcorder printer macbook functions write protection switch ecc software included recoverx manufacturers warranty lifelong st