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letter electronics (shenzhen) co., ltd and yun electronics (shenzhen) co., ltd is by ups the top five producers world international group of "flying" reinvestment two wholly owned manufacturer in shenzhen, specializing in the production of uninterruptible power supply equipment and other related equipment and components of the development, production, sales, service, etc. products 100% export, mainly exported to the united states, europe, japan, singapore, australia and other countries. the company is located in shenzhen shatoujiao bonded area, covers an area of  square meters. the company with world-class led? bai yue  brook  beach play  h  dm manufacturers, in the international market accounted for 80%, win. since cast factory, for well-known brands abroad