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Interoperability between the EVSEs is a challenge. While Japan and Korea have adopted CHAdeMO, Europe have gone for CCS; and USA have all four types of EVSEs. Tesla have built their own super chargers in popular Tesla markets. China have developed fast chargers based on the Chinese GB/T standards. Nissan Leaf cars are sold in Europe with CCS Adaptors while Tesla sells an adapter to connect to CHAdeMO chargers. Some makes of EVSE come with CCS and CHAdeMO guns that can charge both types of vehicles.