The SBAC-US30 USB 3.0 SxS Memory Card Reader from Sony enables you to transfer files from your SxS memory cards to your computer and vice-versa if your computer has no ExpressCard slot. The reader itself is equipped with an ExpressCard slot, and connects to your computer via the USB 3.0 interface. The SBAC-US20 offers read/write speeds of up to 800 Mb/s for SxS Pro and SxS-1 cards, and 1.3 Gb/s for SxS Pro+ cards.