SanDisk 128GB Extreme UHS-I microSDXC Memory CardDesigned for microSD devices such as smartphones, drones, and action cameras that can capture Full HD and 4K video, as well as raw and burst photography, the 128GB Extreme UHS I microSDXC Memory Card from SanDisk has a capacity of 128GB, is compatible with the UHS I bus, and features a speed class rating of V30, which guarantees minimum write speeds of 30 MB s. If your device does not support the V30 standard, this card also supports the U3 standard,