Motor: 1500w brushless Battery: 48V/20Ah x 2units, silicone power Wheel size: 3.00 ,10 Brake: disc brake Loading capacity: 100kg net weight: 136kg Top speed: 65km/h Climbing gradient: 20 degree Running distance per full charge:80km Operating temperature range: -50°C - +60°C Charging time: 6hours Recharging times: over 400 times. We have done many tests on the model. It is proved that all data is in accordance with the above. The usual problems from other factorys product are: not powerful enough, especially when climbing speed can not reach 65km/h too many malfunctions on the controller,battery,etc... We are glad that we have solved all these problems finally. CE certificate is available. OEM is acceptable.