There are 4 versions: the 36V 15A (250W) has EN15194 certificate, the 36V 25A is made for the American market (350W). The 48V 15A is also 350W, the 48V 25A is 500W version. The 15A motors have 60NM torque, 25A motors 80NM torque. 36V version have 83 RPM, if I remember correctly, the 48V have 120...