... call, acknowledgement and call relay.VHF Marine Transceiver, VHF Marine Radio, Marine VHF Radio, Marine VHF transceiver, VHF radio, VHF Transceiver, VHF/DSC, Marine Radio, Boat Radio, Marine Transceiver, Boat TransceiverGeneral: Frequency ... tolerance: ±10ppm(-20+60 temp.)Power supply: 13.8VDC(±15%)Antenna lmpedance: 50 OhmAudio Output:8 OhmMicrophone imput: 2KOhmDimensions-(WHD): 220x110x109 ...