D-Link 2-Port USB 3.0 ExpressCard (DUB-1320) Add 2 USB 3.0 ports to your laptop Backward Compatible to USB 2.0 and USB 1.1 Transfer rates of up to 5Gbps - 10X faster than USB 2.0 Up to 900mA of power per port with the included power adapter Connect up to 127 USB devices by cascading multiple hubs Add 2 USB 3.0 ports to your laptop Backward Compatible to USB 2.0 and USB 1.1 Transfer rates of up to 5Gbps - 10X faster than USB 2.0 Up to 900mA of power per port with the included power adapter Connect up to 127 USB devices by cascading multiple hubs Easy Installation, hot-swap compliant