Support for UHS-1 ultrahigh-speed bus interface Extreme speeds of 40MB/s reading & 10MB/s writing IOPS reaches 500 reading & 150 writing, surpassing the same class ten fold. Enough to satisfy the high-speed access requirement of smart phones, tablets & vehicle recorders Team Groups Xtreem micro SDXC UHS-1 is a high-performance memory card designed specifically for smart phones, tablet computers, & vehicle recorders. It features speeds of 40MB/s reading & 10MB/s writing. Thanks to the enhanced IO access capability, IOPS is able to reach 500 MB/s reading & 150 MB/s writing, exceeding substantially the limits of the same class, enough to satisfy the requirement of smart phones to frequently access small files.