Six months after unveiling the Aventador, plans for a roadster version were leaked by the U.S. EPA by including the model on a data sheet on its website. Lamborghini officially unveiled the Aventador J to the world at the 2012 Geneva Motor Show. The barchetta concept car used the same V12 engine as the standard Aventador, producing 700 PS (690 hp; 515 kW) with the same transmission as the coupé. It did not have air conditioning or radio to save further weight, for a total of 3,472 lb (1,575 kg).  The car presented at the Geneva show was the only unit to be produced, and was sold for US$2.8 million.