The Dual Slot USB3.0 Reader gives super fast transfer of image files when used with Lexar UDMA CF cards. Also supports standard CF, SDHC and SD cards, and is compatible with the UDMA 7 cards. When used with a USB3.0 port, transfer speeds of up to 500MBps are possible. SD and CF card can be read simultaneously, and files can be transferred from one card to another. An activity light extinguishes when the transfer is complete. The robust clamshell design folds closed to protect card slots, and it is backwards compatible with USB 2.0 and 1.0.