Fast enough to keep up with the action The SanDisk Extreme® microSDXC™ memory card lets you save time transferring media with read speeds of up to 190MB/s powered by SanDisk® QuickFlow™ Technology (64GB – 1TB). Pair with the SanDisk® Professional PRO-READER SD and microSD™ to achieve maximum speeds (sold separately). With write speeds up to 130MB/s, it’s ideal for your Android™ smartphone, action cameras, or drones. This high-performance microSD™ card handles 4K UHD video recording, Full HD video, and high-resolution photos. Plus, it’s A2-rated, so you can get fast application performance for an exceptional smartphone experience.