64gb 128gb is SDXC U3 Super speed. Write Speed: Max 40MB/s; Read Speed: Max 80MB/s
Great speed and performance for full HD video recording, high resolution pictures, mobile gaming, music and more.
Compatible with devices with micro SDHC or micro SDXC slots.
Great for Cell Phones, Cameras,MP3/MP4 Player,Vehicle traveling data recorder and more
Tested with Gopro Hero 4 Black in 4K video, all passed the test. Great for Gopro