The SanDisk 512GB Extreme PRO UHS-I SDXC Memory Card is a storage device that can be used with recording devices to store Full HD, 3D, and 4K videos as well as RAW and burst photography content. It is engineered with the UHS-I bus technology and features a speed class rating of V30, guaranteeing 30MB/s minimum write speeds. If your device does not support the V30 standard, this card also supports the U3 standard, which also guarantees minimum write speeds of 30 MB/s. Read speeds are supported up to 200 MB/s and write speeds max out at 140 MB/s.