[1 Pack] iFlash USB 3.0 Dual Slot MicroSD - MicroSDHC - MicroSDXC - SDHC - SDXC Card Reader/Writer - Support SanDisk Kingston 256GB 128GB 64GB 32GB UHS-I Micro SDXC SDHC, Ultra/Extreme Speed Can read and write both MicroSD & SD memory cards to save yourself the effort of carrying two card readers USB 3.0 enables data transfer rates for faster sync times, backward compatible with USB 2.0 / 1.1. Fully powered via your USB port - no additional power supply required. No drivers required for Windows 10/ 8 / 7 / Vista or Mac OS X 10.2 and above. 1 year manufacturer warranty