ship from Japan To experience the speed of 170MB / s, please check the following two points: 1) Please check in advance whether the speed of the USB port installed in your computer is 170MB / S or higher. 2) Please prepare Sandisk's SDDR-B531 card reader. * At the moment (2019/06), the only UHS-1 card reader that has reached 170MB / sec is [Sandisk's SDDR-B531]. Handling of large-capacity flash memory: If you insert a microSDXC card into a product that does not support the SDXC standard, the data in the microSDXC card will be damaged. In that case, it may be formatted and recognized according to the SDHC standard, but the data in the microSDXC card will be damaged regardless of this operation. Never plug it in.