High-Speed File Transfer. The Lexar Professional USB 3.0 Dual-Slot Reader provides maximum high-speed file transfer, with a blazing-fast USB interface speed of up to 500 MB/s. It’s compatible with UDMA CompactFlash (CF), SDXC, SD UHS-I, and SD UHS-II memory cards.

Backwards Compatibility. It’s backwards compatible with USB 2.0, albeit at a much slower transfer speed.