The 64GB UHS-II microSDXC Memory Card with SD Adapter from ProGrade Digital features a storage capacity of 64GB and takes advantage of the UHS-II bus to support maximum read speeds of 250 MB/s and maximum write speeds of 130 MB/s. This card has also been designed with the V60 Video Speed Class rating, which guarantees minimum write speeds of at least 60 MB/s, allowing the card to be optimized for 4K, UHD, Full HD, and 3D video captures, as well as raw photos and rapid-fire bursts. UHS-II cards achieve their speed through an extra row of pins and while this card has been designed for cameras that are UHS-II / V60 compatible, it may be used in devices that do not support UHS-II / V60. However, bear in mind that this card will then default to your device’s speed class and bus rating, such as 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 guarantee minimum write speeds of 10 MB/s. Built for extreme conditions, ProGrade Digital’s 64GB UHS-II microSDXC Memory Card with SD Adapter is able to withstand temperatures from -13 to 185°F, allowing you to take this card with you into extreme environments, such as snow and deserts. It is also resistant against x-rays and shock. Included is a microSD to SD adapter, which allows this card to be used in devices with full-sized SD slots. General Features High-speed certified to perform at a maximum read speed of up to 250 MB/s and a maximum write speed of up to 130 MB/s V60 (Video Speed Class) tested and certified to perform at a minimum sustained recording rate of 60 MB/s A V60 card is essential for uninterrupted video capture by professional DSLR, mirrorless, digital cinema, action, and drone cameras from Sony, Canon, Panasonic, DJI, GoPro, and other manufacturers Optimized for 4K, UHD, Full HD, and most high bitrate MPEG-4 CODECs Certified Video Speed Class 60, UHS-II, U3, and Class 10 make this card compatible with both older and newer SD card devices A laser-etched serial number helps track key components and manufacturing data Rigorous full card testing, plus component-level testing down to individual memory chips provides a high level of quality control Professional-level capacity of 64GB Error correction to detect and correct data write and data transfer errors, plus wear-leveling for integrity and longer life Resistant to x-rays and shock Able to withstand temperatures ranging from -13 to 185° Includes a UHS-II microSD to SD adapter