Key Features • 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's Echo ExpressCard/34 Thunderbolt Adapter High Speed Alternative to Ordinary SD Media Readers Sonnet’s SDXC UHS-I Pro 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! Mac & PC Compatibility For complete Mac and PC compatibility list, visit product's webpage.