***** **********Best Quality Guranteed. *****Up to 100MB/s transfer read speed 667X support high read and fast file transfer speeds. Without equipment encumbrance, you are easy to fulfill data read and file transmission in a short time. (Based on the internal test environment of, so the actual speed may vary with different host devices and environments. For devices that don't support UHS-I, the transmission speed will be different due to interface limitations. )*****UHS-I (U3), Speed Class 10, Video Speed Class 30 (V30) support smooth as well as continuous shooting and Full HD video (4K) recording.
For apps, A1 (App 1) performance helps not only run faster by microSDXC card, but also save devices' storage space memory. (Based on Secure Digital 5.1, A1 performance is 10MB/s continuous read and write speed or 1500 read IOPS, 500 write IOPS. TF cards actual performance will have some discrepancy due to difference of hardware/software platform. *****64GB microSDXC UHS-I Memory Card suppo