Evatran’s Plugless Power wireless/proximity charging system continues to evolve. In the photo gallery below, you can see that the new circular sensor is quite different from the large rectangle that was on display at the Plug-In 2010 Conference. It’s not only the shape that’s changing. From the wall to the car, Plugless Power’s system is around 90-91 percent efficient, and the efficiency across the gap is an astonishing 97 percent. A year ago, the overall efficiency was just 80 percent.