Simultaneously read and write on two cards to save yourself the effort of constant unplugging and re-plugging. USB 3.0 enables data transfer rates of up to 5Gbps 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. Package contents: Anker SD/TF Card Reader, welcome guide, hassle-free 18-month warranty.