The SanDisk memory card is designed as a secure and very small data storage device. The type of memory card is micro SDXC. This smaller format lets it fit into mobile phones and other small electronics. Its data download speed is 90 MB/s, and downloading data from it is at a speed of 170 MB/s. The SanDisk MicroSDXC 128GB Extreme Pro A2 UHS-I (V30) U3 + SD Adapter is of the speed class of Class 10. Thanks to its specifications, it's suitable for very demanding operations like the saving of 4K video. The packaging contains a practical adapter to SD size.