Beijing：

Address：Rm. 1703, Jinyanlong Bldg., Xisanqi, Changping Area Beijing, 100094  China

Tel：010-60789808 

E-mail：zhangkui@lcsonar.com

Guangzhou：

Address：No.32,XingYa 2nd RD,Shilou,Panyu,Guangzhou

Shanghai：

Address：Rm. 804, No. 438, Pudian Road, Pudong New Area, Shanghai