... working mode; 3) Bidirectional audio/video transmission. 2~5W Full-Duplex Digital Audio Bidirectional Portable Transmistter for Traffic ... RS232 level, supporting 1200~115200ModulationCOFDMConstellationQPSK,16QAM,64QAM (optional)FEC1/2, 2/3, 3/4, 5/6, 7/8 (optional ... sorry for not responsible for any reason of delays. 2~5W Full-Duplex Digital Audio Bidirectional Portable Transmistter for Traffic Command ...