... + corrugated paper casePower:Working voltage(VDC)68~90VDCRated Power(W)900wx2,DC brushless motorFull charge time(h)2 ... Safety: Active protection Rider-on detection,Intelligent speed limit,low power, over temperaturerange, over voltage, over load, dangerous riding ... alarm Passive protectionRedundant design control system and power system, internalbreakdown detection and safety alarm & safety shutdown