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Property and Equipment, Net (Tables)
12 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment, net
    As of September 30,   
    2019     2020  
Equipment for rental business   $ 3,171,240     $ 2,173,282  
Production line for e-bicycles     203,646       1,118,521  
Furniture, fixtures and office equipment     22,885       44,869  
Vehicles     27,955       29,121  
      3,425,726       3,365,793  
Less: accumulated depreciation     (1,261,869 )     (256,748 )
Property and equipment, net   $ 2,163,857     $ 3,109,045