The Echo ExpressCard/34 Thunderbolt Adapter from Sonnet is an excellent way to expand your interface options on your Thunderbolt-enabled Mac computer. This external adapter connects to a Thunderbolt port and features an ExpressCard/34 card slot with the PCI Express 2.0 x1 bus interface. You can add Gigabit Ethernet, FireWire, USB 3.0, CompactFlash, and SDXC flash card connectivity to your computer. All you need is the relevant ExpressCard/34 to fit into the adapter. In addition, the adapter also supports specialty adapters like the latest revision PCIe Bus Extender for Sonnet's Qio Professional Media Readers, and the interface adapter for the AJA io Express. Plus, you can hot-swap cards.