In March 2017, a five-member CAQI China quality inspection and certification expert group conducted on-site inspections of the production of HARMAN brand professional audio, public broadcasting, and conference system production and raw materials. The certification expert group conducted a strict and standardized review of several major series of products by consulting the data, on-site inspection of the production workshop, and on-site personnel inquiries. On the same day, the on-site preliminary examination data review passed smoothly. In the past 5 years, our factory has not recorded any non-conformities in the quality inspections at all levels. Part of the speaker and amplifier products were taken at the production workshop site and brought back to the Fifth Institute of China Quality Inspection for repeated testing and testing for three months.