The SanDisk Extreme microSDXC memory card lets you save time transferring media with read speeds of up to 170MB/s(1) powered by SanDisk QuickFlow Technology(3). Pair with the SanDisk Professional PRO-READER SD and microSD to achieve maximum speeds (sold separately). With write speeds up to 80MB/s(1) it’s ideal for your Android smartphone, action cameras, or drones. This high-performance microSD card handles 4K and 5K UHD video recording, Full HD video(3), and high-resolution photos. | (1)Up to 170MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, requires compatible devices capable of reaching such speeds. Up to 80MB/s write speeds. Based on internal testing; performance may be lower depending upon host device interface, usage conditions and other factors.