In 2010, Audi unveiled a prototype series-hybrid electric car, the A1 e-tron, that incorporated a small 250-cc Wankel engine, running at 5,000 rpm, which recharged the car's batteries as needed, and provided electricity directly to the electric driving motor. In 2010, FEV Inc said that in their prototype electric version of the Fiat 500, a Wankel engine would be used as a range extender. In 2013, Valmet Automotive of Finland revealed a prototype car named the EVA, incorporating a Wankel powered series-hybrid powertrain car, utilizing an engine manufactured by the German company Wankel SuperTec. The UK company, Aixro Radial Engines, offers a range extender based on the 294cc-chamber go-kart engine.