Additional reactive braking response, a novel parking mechanism, and the ability to lock the wheel with a person hand only. This bike is a lot of enjoyable! The guys at Surron Motor had been super beneficial with almost everything. I used to be so energized if the bike eventually arrived. https://surronstormbee37036.blogunteer.com/35919323/getting-my-surron-ultra-bee-charger-to-work