Since this USB style one does not have these lines, the black IC on the board is the 3.3 V voltage regulator which receives its power form the external 4 pin molex connector, which has a 12V and a 5V line on it along with 2 ground/return lines. The capacitors are used for any noise cancellation/stabilization of the power lines.
That, my friend, needs to be in your OP and on the website as the selling point. You'll sell out faster than you can take orders.