Abstract: A remote control unit of a portable personal radio station, said remote control unit being provided with a microphone, a loudspeaker, a transmit/receive switch, an aerial and contact means. All these devices are mounted in a housing which either acts as the control unit of the personal radio station or as a plug-in unit by which all functions of the station may be transferred to an auxiliary set, which for example may be mounted within a car. It is then possible to operate the station from said auxiliary set without need for the operator to release the personal radio station from the shoulder bag within which the station is carried. When the operator enters the car he just plugs the housing into a socket member provided in the front panel of said auxiliary set and the station is then controlled from controls on the panel of said auxiliary set.