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Significant Concentrations
 6 Months Ended
Mar. 31, 2014
Significant Concentrations [Text Block]

18. Significant Concentrations

(a) Customers and Credit Concentrations

The Company had nil and two customers that individually comprised 10% or more of net revenue for the three months ended March 31, 2013 and 2014, respectively, as follows:

  Three months ended March 31,
  2013   2014
Jiangsu Huatiantong Technology Limited. $  *     *   $ 3,477,100     10.14%  
Dongguan Yulong Telecom Technology Co., Ltd.   *     *     3,720,890     10.85%  

*Comprised less than 10% of net revenue for the respective periods.

The Company had two customers that individually comprised 10% or more of net revenue for the six months ended March 31, 2013 and 2014 as follows:

    Six months ended March 31,
  2013   2014  
Jiangsu Huatiantong Technology Limited. $  *     *   $ 8,281,999     10.80%  
Tinno Mobile Techonlogy Company Limited.   *     *     9,491,721     12.38%  
Dongguan Yulong Telecom Technology Co., Ltd.   12,628,627     11.71%     *     *  
Shenzhen Fuheqing Industrial Development Co., Ltd   10,824,312     10.04%     *     *  
                     
*Comprised less than 10% of net revenue for the respective periods.                    

The Company had two and one customers that individually comprised 10% or more of accounts receivable as of September 30, 2013 and March 31, 2014, respectively, as follows:

  September 30, 2013      March 31, 2014  
Shenzhen DRN Battery Co., Ltd. $ 7,365,219     14.77%   $  *     *  
Beijing Beny Wave Technology Ltd.   6,811,680     13.66%     5,305,866     11.45%  

*Comprised less than 10% of accounts receivable as of March 31, 2014.

(b) Credit Risk

Financial instruments that potentially subject the Company to a significant concentration of credit risk consist primarily of cash and cash equivalents and pledged deposits. As of September 30, 2013 and March 31, 2014, substantially all of the Company's cash and cash equivalents and pledged deposits were held by major financial institutions located in the PRC, which management believes are of high credit quality.