The Roadster Foundry Mobile Connector shown in the photo was designed by Martin Eberhard, one of the founders of Tesla Motors. He made and sold several of them, but they were housed in a plastic junction box rather than the metal case shown in the photo. The design was adaptable to different sockets using pigtails as on the UMC 240. Martin didn't want to be in the business of making these, so he transferred the design to EV Components who made the one shown in the photo. Tesla was not involved in the manufacturing of these charging devices except that in order to get the connector that attaches to the car a buyer would have to deliver the yellow 110V cable provided by Tesla to Martin or later to EV Components so the connector could be harvested to put onto the larger cable for the 240V charging. The yellow cable was returned as one of the pigtails.