A super fast and high-capacity data transfer solution. Compact hidden design to save space. Stable and reliable ASMEDIA Chipset ASM1042. Compliant with USB 3.0 specification. Date transfer rate up to 5.0Gbps / 625MB/s. Compatible with USB 2.0 & 1.1 specification. Compliant with ExpressCard Specification 1.0. Compliant with ExpressCard/54mm standard. Compliant with standard 54mm ExpressCard slot. One end is 2 port USB 3.0 type A female connectors and another end is standard 54mm ExpressCard. Plug & play and hot swapping capability. Bus-powered mode and no external power required for most of peripherals. External 5V DC jack (power cable included) for high current consumption USB devices. Support Windows XP / Vista / 7 / 8. Package Content: 1X Brand New 2 Port Hidden USB 3.0 ExpressCard 54mm Adapter. 1X USB DC Cable. 1X Driver CD.