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Top speed meets high capacity Pro performance for faster shots, 4K UHD, and accelerated app performance7. SanDisk Extreme PRO microSDHC,M and microSDXC" cards are built tough for extreme durability, even under challenging environmental conditions3. Extreme speeds let you capture every detail of adventure and take the wait out of transferring your videos between devices. Storage capacities from 32GB to 128GB expand your device's memory and lets you record 4K UHD video.