The 256GB SanDisk Extreme microSD card offers transfer speeds up to 190MB/s and A2 application performance, and comes with an SD adapter for versatile use. I'm selling it because I opened it but didn't use it. - Brand: SanDisk - Model: Extreme - Capacity: 256GB - Speed Class: V30 - UHS Speed Class: U3 - Application Performance: A2 - Accessories: SD adapter - Transfer Speed: Up to 190MB/s I purchased this authentic product from Amazon. No claims or returns accepted to prevent product substitution. Thank you for looking.