With a speed rating of 1900X, the 64GB 1900X UHS-II microSDXC Memory Card from Delkin Devices supports data read speeds of up to 285 MB/s and data write speeds of up to 100 MB/s. Transfer rates this fast make it easy to record HD video, 4K video, and even capture RAW Burst photos. In addition to the enhanced maximum transfer rates, this memory card comes UHS Speed Class 3 (U3) certified, denoting a minimum write speed of no less than 30 MB/s. By inserting this memory card into your camera or other mobile device you can take advantage of extended battery life as this card is designed to draw up to 30% less power than comparable cards. You can also take the 64GB Delkin Devices microSDXC memory card with you nearly anywhere you go as it comes water, shock, and X-ray proof.