PSI Korea has develops and produced 2.4-GHz home wireless phones with its own wireless communication technologies, and sells the products large malls. The company developed patented micro-speaker technologies to product RST earphones, and launched the products in the earphone markets in Korea. The company participated in CEBET show in Germany and Electronics Fair in Hong Kong to export the products in the world markets. At the fairs, the company executes export contract with Nutz Audio of U.K., and started export to U.S., the Middle East and U.K. The changes in the markets reduced demands for wire earphones and activated Bluetooth markets, and export of wire earphone was not achieved any more. The company developed two models of Bluetooth products, and participates in number of fairs and discusses with its buyers for export the developed products.