The Sx2 Dongle is the perfect tuning tool for E Bikes with the new Bosch Active or Performance Line engines (2014 model). The Sx2 Tuning Dongle doubles the engine support from 25 km/h to 50 km/h – this means, you can drive twice as fast! The dongle causes no changes in the engine electronics and all Bosch assistance levels are retained. A major advantage of the Sx2 Dongle is that it´s very easy to install (“plug & drive”) and can be removed within seconds if you want to drive legally on public roads again. The Sx2 Bosch Tuning Dongle is waterproof, permanent maintenance free and requires no battery.