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The 2A series automatic two speed electric drive axle assembly is suitable for 14 seat/17 seat/23 seat electric sightseeing vehicles, small trains, small electric sanitation vehicles/buses/public transportation and other vehicle models. Its first gear high speed ratio increases the vehicle's climbing slope by 50%, and its second gear low speed ratio increases the vehicle's speed by 30%; The system has high safety and can be urgently disengaged from neutral to disconnect the power transmission, avoiding electronic control tube explosion and battery overcharging caused by excessive vehicle speed; By automatically shifting gears, the overall driving range can be increased by more than 10%.