Our most powerful SD UHS-I memory card yet deliver performance that elevates your creativity. With shot speeds of up to 90MB/s and UHS speed Class 3 (U3) recording, youre ready to capture stunning, high-resolution, stutter-free 4K UHD video. And, because your pace doesnt let up after the shots are in, it delivers up to 170MB/s transfer speeds for a faster postproduction workflow requires a compatible device capable of reaching such speeds, such as the SanDisk SD UHS-I card reader (sold separately). Plus, its built to withstand weather, water, shocks and other less-than-ideal conditions so you can rest assured that its good to go wherever your work takes you. Up to 170MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. Write speed up to 90 MB/s. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. X = 150KB/sec. (1)Full HD (1920x1080) and 4K UHD (3840 x 2160) video support may vary based upon host device, file attributes and other factors. (2)UHS Speed Class 3 designates a performance option designed to support 4K UHD video recording with enabled UHS host devices. UHS Video Speed Class 30 (V30), sustained video capture rate of 30MB/s, designates a performance option designed to support real-time video recording with UHS enabled host devices.