The SanDisk Extreme Plus Class 10 microSD Memory Card is great for photographers and content creators who need extra storage and fast transfer speeds.V30 and UHS Speed Class 3 ratings - allow smooth 4K and 5K video recordingUp to 250 MB/s read and 170 MB/s write speeds - transfer a 10 GB file in about a minute64 GB storage - stores roughly 21,000 photos or 20 hours of HD videoSanDisk Memory Zone app - makes it easy to back up files and free up space on your deviceDurable design - protects files from water, drops, shocks, magnets, X-rays and extreme temperatures