Designed for professional photographers and videographers, the 128GB /256GB POWER UHS-II microSDXC Memory Card from Delkin Devices features a storage capacity of 128GB /256GB and takes advantage of the UHS-II bus to support maximum read speeds of 300 MB/s and maximum write speeds of 250 MB/s. This card has also been designed with the V90 Video Speed Class rating, which guarantees minimum write speeds of at least 90 MB/s. All of this allows for users to capture 8K, 4K, 3D, HDR, high-speed and high-frame-rate recordings, and multiple video streams created by 360° cameras. It also supports data-intensive simultaneous captures, such as raw and JPEG, as well as video, still, GPS data, and time-lapse. UHS-II media achieves its speed through an extra row of pins and while this card has been designed for cameras that are UHS-II / V90 compatible, it may be used in devices that do not support UHS-II / V90. However, bear in mind that this card will then default to your device's speed class and bus rating, such as UHS-II and V60, which supports minimum write speeds of 60 MB/s, UHS-II and V30, which supports minimum write speeds of 30 MB/s, or UHS-I and U3, which also supports minimum write speeds of 30 MB/s. 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 for extreme conditions, Delkin's 128GB /256GB POWER UHS-II microSDXC Memory Card is protected against water, shock, and x-rays, and also features built-in error correction and wear leveling. Included is a UHS-II microSD to SD adapter, allowing this card to be used in SD-compatible devices, as well as a protective storage case.