The Angelbird 256GB AV Pro Mk 2 UHS-II SDXC Memory Card is designed for high resolutions, frame rates and bit depths, which renders it well suited for storing Full HD, 4K+, and 3D video, and continuous burst photography in DSLR and drone systems. Besides a storage capacity of 256GB, this memory card features UHS-II bus to support sustained read speeds of 280 MB/s and write speeds of 260 MB/s, as well as sequential read speeds of 300 MB/s and write speeds of 280 MB/s. In addition, a V90 Speed Class rating guarantees minimum write speeds of 90 MB/s. Please note that while this card may be used in devices that do not support UHS-II and V/90, it will default to your devices speed class and bus rating. If your device does not support U3, this card is compatible with the U1 and Class 10 standards, each of which guarantees minimum write speeds of 10 MB/s. Built to be tough and durable, this Angelbird memory card is protected against dust, water, shock, x-rays, magnets, and temperatures ranging from -25 to 85 °C. Furthermore, this card also features ECC data reliability, wear levelling, and power management for low power usage, and a built-in write-protect to safeguard your content from being erased.