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Chaozhou Sanhuan (Group) Co., Ltd., founded in 1970 and listed in Shenzhen Stock Exchange in 2014 (stock code: 300408), is a comprehensive enterprise dedicated to research, development, production and sales of electronic basic materials, electronic components, communication devices and other products. The company's products cover many application fields such as optical communication, electronics, electricians, machinery, energy conservation and environmental protection, new energy and fashion, among which the production and sales of ceramic inserts for optical fiber connectors, alumina ceramic substrates, and ceramic substrates for resistors are in the forefront. The company has been rated as a national technology enterprise and a single champion demonstration enterprise in China's manufacturing industry, and has been ranked in the top ten of China's top 100 electronic components for many consecutive years.