Sonnet"s SDXC-UHSI-E34 Reader/Writer ExpressCard/34 quickly transfers files from SDXC and SDHC memory cards to your ExpressCard slot-equipped MacBook Pro or Windows notebook computer on-location, in the studio, or office. No ordinary card reader, this UHS-I speed class-compliant adapter supports at full speed the fastest available SDXC and SDHC memory cards and future cards up to 104 MB/s!Sonnet"s SDXC UHS-I Pro Reader/Writer ExpressCard/34 uses the 2.5 Gbps PCI Express interface incorporated into ExpressCard slots, so it delivers performance superior to adapters that use the ExpressCard slot"s slower USB 2.0 interface. Also unlike common SD media readers, Sonnet"s SDXC UHS-I Pro Reader/Writer ExpressCard/34 has the extra pins necessary to support SDXC UHS-I and SDHC UHS-I memory cards at full speed. If you"re a photographer or videographer using equipment that relies on fast, high capacity SDXC or SDHC cards, this Sonnet adapter will save you time and accelerate your workflow.