4-in-1 Multi-Card Reader/Writer □ Micro SD □ SD Adapter Card Micro SD Card 256MB SD Adapter also included Supported Media: SD, TF, SDHC, SDXC, microSD, microSDHC, MS DUO, MS PRO DUO, micro MS Aluminum exterior USB 2.0, 4-slot expansion Windows 11, 10, 8.1, 8, 7, XP If not recognized when directly plugged into a USB port on Windows 10 or later, connecting the reader/writer to a USB hub may allow it to be recognized. Please note that we will not exchange the product if it is not recognized on your Windows PC, even if it was recognized in our environment. Also, it will not be recognized in a Mac environment.