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A close-up of the USB Hub on the Control panel that connects all the controls to the PC. The USB Hub also powers the Trackballs, Spinners and Trackball 12v back-lights. The USB Hub provides 5v directly for the Trackballs & Spinners. The little Circuit Board below the USB Hub, converts 5vDC to 12vDC for the Trackball 12v LED Bulbs.