Head Office established in 2008, have about 25 years history. Now it have two companies in china mainland (1) Serene electronic factory , which mainly in produce and sell the water power clock ,water power calculator and keyboard abroad; (2) Dongguan Xieneng electronic Co., Ltd , which as the sells company mainly in sell our product in China and Asia. As the marketing increase, the company get larger develop. In the year of 1987 the company have bought the new workshop and invested more money...View More