Designed for action cameras and mobile devices, the 64GB Extreme UHS-I microSDXC Memory Card from SanDisk features a storage capacity of 64GB and supports maximum read speeds of 170 MB/s and maximum write speeds of 80 MB/s. This card has also been designed with the V30 Video Speed Class rating, which guarantees minimum write speeds of at least 30 MB/s. All of this allows for users to immerse themselves in extreme sports videography and photography at resolutions of Ultra HD 4K (3840 x 2160) and Full HD (1920 x 1080).