Save time with the SanDisk Extreme® SD UHS-I memory card - transferring content at read speeds of up to 170 MB/s with SanDisk® QuickFlow™ technology. For maximum speeds, pair the SanDisk® Professional PRO-READER SD and microSD™ (sold separately). You're ready to capture the best resolution, uninterrupted 4K UHD video1, with up to 80 MB/s recording and U3 recording class. What's more, it's designed to withstand bad weather, water, shock - so you can rest assured that your recording will remain perfect wherever you are.