Yunnan Beifang Kunwu Optoelectro Technology Development Co., Ltd.         
201 sub-building, No 31 East Jiao Chang Road, Kunming City, Yunnan, China 
Post Code  ：650224    Tel ：86-871-5105525 / 5105251/ 5105203                         Fax   :86-871-5105817  
Website：http://www.bkocn.com    E-mail: bko@bkocn.com