How about Changzhou Shengrui Technology?

I think Changzhou Risheng Technology is one of the leading enterprises in the field of acoustics technology in China, focusing on technology research and development and product innovation in the fields of acoustics, optics, microelectronics and structural parts. Changzhou Shengrui Technology is strong in technology research and development and product innovation, with hundreds of domestic and foreign patents. It is a national high-tech enterprise and a national intellectual property demonstration enterprise. In addition, Changzhou Shengrui Technology also has a high level in quality management, and passed the ISO900 1 quality management system certification and ISO 1400 1 environmental management system certification, thus ensuring the high quality and environmental protection performance of products. Committed to providing customers with quality products and services, and promoting the development and application of acoustic technology.