According to USRobotics, the hub and adapter offer 900mA powered ports, but, the company noted, how much power depends on the power source. The ExpressCard provides 800mA using the USB port cable that is included with adapter; to provide 900mA requires using an add-on DC power. To get the power needed to provide 900mA, the hub uses a DC power adapter. USB 3.0, so-called "SuperSpeed USB," connections can provide data connections at up to 5Gbps -- up to 10x that of USB 2.0's 480Mbps. For example, according to USRobotics, 30GB of data would take about 16 minutes to transfer via USB 2.0, versus only 5.5 minutes via USB 3.0.
USRobotics Launches USB 3.0 Products
USRobotics USR8401 2-Port USB 3.0 ExpressCard