This unique adapter enables you to transfer files concurrently from two CF memory cards to your MacBook® Pro computer on-location or in the field, studio, or office. This Sonnet adapter supports the fastest available CF memory cards and future CF cards up to 886x at full speed, making it a superior alternative to USB memory card readers. Pro Dual CompactFlash Adapter ExpressCard/34 is compatible with MacBook Pro systems running Mac OS® Version 10.5 or higher.

Speed: Pro Dual CompactFlash Adapter ExpressCard/34 uses the 2.5 Gbps PCI Express interface incorporated into ExpressCard® slots, so it delivers performance superior to adapters that depend on the ExpressCard slot’s USB 2.0 interface.

Convenience: Transferring data from two cards concurrently, rather than swapping them out of the adapter, makes for a significantly more convenient and efficient workflow. Its compact size allows it to fit into a gear bag, with no dangling cable.

Support: Sonnet’s dual-slot CF memory card adapter accepts two Type I (flash memory) cards or a combination of one Type I and one Type II (hard drive) card. It supports UDMA6 transfer modes with sustained data transfers up to 133 MB/sec.

read a review of this unit at macworlds website