The SanDisk memory card is a secure and very small device for the storage of data. The memory card type is micro SDXC. This smaller format lets it fit into mobile phones and other smaller electronic devices. It has a writing speed of 90 MB/s. Reading from it is at a speed of 160 MB/s. The SanDisk MicroSDXC 256GB Extreme A2 UHS-I (V30) U3 + SD Adapter fits into the speed class of Class 10. Thanks to its parameters, it's perfect for highly demanding work like the storage of 4K video. The SanDisk memory card also has waterproofing, highly resistant to impacts, and it will even work at high temperatures. It is also worth mentioning its resistance to X-rays and magnetism. The packaging includes a very useful adapter to SD size.