Our company specializes in the vehicle-mounted GPS positioning and intercom system for 5 years, one hour near Zhengzhou Airport, we can also supply ODM, OEM service to you, and our products have passed the CCC and Ex Certificate, this is how we keep good quality and competitive prices for global valued customers.Our company independent researching and developing Shuangtu T-series terminal device is GPS positioning wireless intercom system which is based on CDMA, GSM or GPRS internet, it can r...View More