Exclusive use of special new technology (High efficiency, torque and low price),making the serviceworking life longer. model JD-BLM-003 outer diameter(mm) 300 power(w) 350/500 volatge(vdc)24/36/48 efficiency(%)>80 weight(kg)6.2 characters: Large power: variable from 180W to 500W Speed ranges: 4kph to 6kph with the throttle Voltage: 24/36/48v Different tire width availableas clint's requirement waterproof and dustproof 1year warranty