Operating system Shenzhen youshangfeng communication equipment Co., Ltd. (hereinafter referred to as "I & YSF youshangfeng") is a communication equipment company specializing in wireless communication terminal products, digital navigation terminal and platform technology development, as well as production and sales. I & YSF youshangfeng is located in Room 601, building 4, 1970 science and Technology Park, Minxing Industrial Zone, Minzhi Street office, Longhua New District, Shenzhen City, with an independent R & D and manufacturing team; at present, the company has more than 100 cooperative R & D technical developers. The company has a number of patents and technical development strength of navigation communication products of GSM and CDMA, and is researching and developing the third generation mobile navigation communication terminal products based on CDMA EVDO technology and WCDMA, LTE technology.