The Transcend 64GB 340S UHS-I A1 SDXC Card is ideal for use with UHS-I compliant DSLR cameras and camcorders. Manufactured with 3D NAND flash memory, the SDXC card provides reliability. In addition to fast transfer speeds, the SDXC card is Video Speed Class 30 (V30) compliant, allowing for smooth, uninterrupted 4K video capture. The transfer rates of this SDXC card allow you to shoot in fast action burst mode without dropping frames. They are also compliant with the A1 specification.