This is the Transcend 256GB microSDXC memory card, Class 10 UHS-I rated at U1/U3 V30 A1, supplied with a full-size SD adapter so it works in either a microSD-native device (phone, action camera, drone) or any standard SD card slot on a camera, laptop or card reader. The V30 video-speed class guarantees a minimum sustained write speed of 30MB/s, which is enough headroom for continuous 4K video recording without dropped frames, making this card well suited to dash cams, drones and action cameras as well as general smartphone storage expansion. The A-rated application performance class (A1) additionally guarantees minimum random read/write IOPS, which matters if the card is used to run apps directly from a device like an Android phone or a Raspberry Pi rather than just storing media files. At 256GB it offers substantial capacity for photo, video or general file storage in a compact microSD form factor.