Greg Johanson, president of Solar Electric Vehicles in Westlake Village, California, said his company makes a roof-mounted panel for a standard Prius that enables the car to travel up to 15 additional miles a day.

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Its iDrive user interface consists of an LCD panel mounted in the dashboard and a controller knob mounted on the center console, and it controls a vast and disparate number of functions in BMWs.

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You can then configure each panel with either two side-mounted speakers or a single speaker under the panel which Sharp claims will produce clear, natural sound.

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