The 256GB SanDisk Extreme PRO microSDXC card offers a UHS-I standard with read speeds up to 200MB/s and write speeds of 140MB/s, making it ideal for 4K video recording. - Brand: SanDisk - Model: Extreme PRO - Capacity: 256GB - Speed: 200MB/s (Read), 140MB/s (Write) - Standards: UHS-I, V30, A2 Thank you for viewing.