wireless digital transceiver -portable & clear voice -full duplex,digital& wireless -distance over 700m ... maintenance, line construction, mining building site, etc.. real-time communication.2,Repair site real-time communication.3,Secure communication, digital wireless ... with the provisions of the Ministry of information industry. 2. Uses the 2.4GHz public band: 2402~2483.5Mhz. 3. Use adaptive ...