The PNY Elite-X 256GB micro SD card is rated class 10, U3, which s fast transfer speeds so you can quickly transfer and share your content while you're on the go. Performing at read speeds of up to 100MB/s, It is perfect for use with the latest smartphones, tablets, action cameras, 360O cameras, drones and more. Rated A1 for better app performance on Android devices, PNY Elite-X allows users to run apps faster and directly from the Micro SD card, saving more space on smartphones. PNY Elite-X also features V30 video speed Class ideal for 4K Ultra HD video at 4096x3072 format.