Installing the Power USB Module The Workstation 625/655 supports an optional power USB module. The hex key is required for installation. Place the Workstation 6 Adjustable Stand on its back. Unscrew the two hex screws by turning the hex key counter clockwise to release the USB cable from the USB cover. Insert the USB cable into the USB connector on the left side of the power USB module. Insert the power cable connector into the power supply inlet on the right side of the power USB module. Place the power USB module vertically down into the base unit compartment, and then slide it forward all the way to the edge. Tighten both thumbscrews by turning them clockwise to secure the power USB module to the Workstation 6 Adjustable Stand.