Shenzhen Double Spring Technology Development Co., Ltd. is a collection of technical production, processing, distribution and wholesale of private enterprise. Main products: fuel Bicycle, Bicycle plug-in, micro DC digital generator, variable speed electric vehicles, electric vehicles such as motor home. Shenzhen Spring Technology Dual technology development to the abundant technical strength, reasonable prices, excellent service and a number of enterprises established long-term cooperative relationship, warmly welcomes all to visit and negotiate business.