... corrugated paper casePower:Working voltage(VDC)68~90VDCRated Power(W)970wX2,DC brushless motorFull charge time(h) ... Active protection Rider-on detection,Intelligent speed limit,low power, over temperature range, over voltage, over load, ... status, intelligent safety alarmPassive protectionRedundant design control system and power system, internalbreakdown detection and safety alarm & safety shutdown