The radio telemetry module can transmit and receive RS232 data up to 3.5 kilometers away. They are ideal communication devices for GPS differential correction between base stations and VBOX units, and can also be used for communication between VBOX modules or for data transmission from remote VBOX to laptops. Each wireless device provides a magnetic mounting antenna and is connected through a cable. It has a range of different frequencies and ranges to choose from, suitable for different requirements around the world. Long distance, multi band wireless modules can be set up to transmit or receive data between 403MHz and 470MHz. The multi band and power of these wireless modules enable them to be used in many countries. Please check the local RF license plate management. Typically, with a maximum distance of 10km (1W), these wireless modules can be used in conjunction with base stations to provide DGPS wireless coverage for the entire test field.