Reliable photo and video storage for phones tablets PDAs and more. UHS-1 stands for Ultra High Speed - 1 and is one of the fastest categories of memory card available today with a bus interface speed of up to 104 MB/sec. Kingston's microSDHC/SDXC Card ? Class 10 UHS-I speeds of 45MB/s read and 10MB/s write. High Performance like this is necessary to get the most out of todays best mobile devices such as the Samsung Galaxy S6 which can record 4k video.