In a communications system for an individual who has access to a vehicle-mounted two-way radio and a portable two-way radio which includes a speakermic having a speaker through which audible messages are transmitted for the individual to hear, there is provided a volume control arrangement associated with the speakermic through which the audio volume of the speakermic speaker can be adjusted. The system also includes a transmitter for transmitting a signal to the volume control arrangement that the individual is seated in the vehicle, and further includes a transmitter for transmitting a signal to the volume control arrangement that the mobile radio is energized. A receiver is associated with the volume control arrangement of the speakermic so that upon receipt of the signals transmitted from the two transmitters, the audio volume of the speaker of the speakermic is automatically lowered.