Abstract: An automobile telephone apparatus comprising a CPU memory means for repertory dialing, and sound producing means to provide audible feedback to the user. The device emits a tone pulse each time a button is activated. Upon completion of entry of a repertory dialing code, the apparatus searches its memory, and if a corresponding telephone number is found, a final valid tone indicator is emitted and the telephone number is displayed. Alternatively, if no stored telephone number is found, an error tone is sounded. Thus, the user need not divert his attention to the display in order to establish the validity of the inputted code.