We can offer quality control service.scope of service:Acoustoelectric product including HI-FI speaker,car speaker,drive,speaker parts,acoustoelectric component. service item: initial production check,During production check,Final random inspection,Loading supervision,Factory assessment,Looking for suppliers with best price and best quality. Warmly welcome oversea or domestic clients to cooperate,trade and join venture. please visit our website: http://www.k-and-d.com to get the details.