Sonnet SDXC-UHSI-E34 - Card Reader - ExpressCard/34 (GW1939) Category: Memory Card Readers Supports UHS-I SDXC and SDHC media at maximum speeds today, with sustained data transfers up to 104 MB/sec as faster, next generation cards become available Uses the ExpressCard slot's PCI Express interface to deliver performance superior to adapters that depend on the ExpressCard slot's USB 2.0 interface Fits completely inside the ExpressCard slot with no protrusion, the adapter may be left in all the time Compatible with Sonnet'sEcho ExpressCard/34 Thunderbolt Adapter