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Concentrations and Credit Risk (Tables)
 3 Months Ended
Mar. 31, 2020
Concentrations and Credit Risk [Abstract]  
Schedule of revenue by major customers by reporting segments
  Three months ended March 31, 
   2019   2020 
Customer A  $1,321,428    25.55%  $*    * 
Customer B   1,241,675    24.01%   2,093,093    30.33%
Customer C   1,071,820    20.72%   *    * 
Customer D   735,494    14.22%   *    * 
Customer E    *    *    3,796,267    55.01%

 

*  Comprised less than 10% of net revenue for the respective period.
Schedule of accounts receivable by major customer

 

   December 31, 2019   March 31, 2020 
Customer A  $902,309    11.47%  $*    * 
Customer B   1,725,293    21.93%   1,617,568    15.18%
Customer C   1,713,628    21.78%   1,544,088    14.49%
Customer E   *    *    4,193,562    39.35%
Customer F   830,821    10.56%   *    * 
Schedule of net purchase by suplier
  Three months ended March 31, 
   2019   2020 
Supplier A  $996,484    32.66%  $*    * 
Shenzhen BAK   *    *    3,841,680    82.43%

 

* Comprised less than 10% of net purchase for the respective period.
Schedule of accounts payable by suplier
  December 31, 2019   March 31, 2020 
Supplier B  $1,126,582    10.10%  $1,107,981    10.26%
Schedule of transactions with the former subsidiaries
  Three months ended
March 31,		 
   2019   2020 
Purchase of inventories from        
Shenzhen BAK*  $-   $3,841,680 
           
Sales of finished goods to          
BAK Shenzhen*  $83,841   $69,226 

 

* Mr. Xiangqian Li, the former CEO, is a director of this company.