Fast reading and writing speeds for taking high-action photos and videos The extreme speed of this powerful microSD memory card ensures data is transferred quickly, apps run faster and high-quality videos can be recorded in 4K UHD.2 This card supports 4K UHD videos, full HD videos and high-resolution photos, making it ideal for Android smartphones, action cameras and drones. The super-fast SanDisk Extreme microSDXC memory card has a reading speed of up to 170 MB/s and a writing speed of up to 90 MB/s. * It also features A2 specification, enabling greater application performance and improving the way your smartphone works.7 Transfer files faster Fast reading speeds allow you to transfer 1000 high-resolution photos or 30 minutes of 4K video footage (24 GB) in less than 3 minutes. Ideal for recording 4K UHD videos 2 Film outdoor adventures, weekend trips or sporting events in the highest quality without skipping frames. With up to 400 GB1, the SanDisk Extreme PRO microSD UHS-I memory card lets you capture uninterrupted 4K UHD and Full HD videos with its UHS Speed Class 3 (U3) and Video Speed Class 30 (V30)4 ratings.