Transcend's SDXC/SDHC 300S memory cards provide the performance and capacity necessary to harness the full power of your UHS-I compliant digital camera or camcorder. In addition to incredible transfer speeds, the cards meet UHS Video Speed Class 30 (V30) standards, allowing for smooth, uninterrupted 4K video capture. *V30 compliance applies only to 64GB-480GB capacity cards. The Transcend USB 3.1 SD & microSD card reader is able to transfer images, videos, and other files from SD & microSD card formats (SDHC/SDXC/UHS-I/UHS-3). this reader is compatible with super-speed USB 3.1 interface (backward compatible with USB 2.0) and features an LED status light. Compatible with both Windows and Mac platforms. Operating System - Microsoft Windows 7, Microsoft Windows 8, Microsoft Windows 10, Mac OS X 10.2.8 or later and Linux Kernel 2.6.30 or later.