Qumox 64GB Class 10 UHS-I U1 SDXC (SDXC Card may not compatible with SDHC Device， Please Check your device can use SDXC before you buy) Write: 50MB/s Read: 80MB/s (Test by USB 3.0 Card Reader) *speed may vary under different computer and card reader Pass h2testw without error， Genuine Memory Card ( please beware some seller sell upgrade memory card which the actual capacity is much lower than what they say， like 64GB but inside only 4GB usable， it will cause data lose and data corrupt )