... for installing an optional RF unit, UR-FR5100 series. Two RF modules can be installed in a chassis reducing installation ... output.Other featuresProgrammable accessory connector (D-sub 25-pin) for connecting trunking controllers or other external devices 5-Tone and DTMF ... , Programming Cable and Related accessories.They are suitable to famous Two-Way Radios, such as MOTOROLA, ICOM, KENWOOD, Yaesu,Vertex ...