A vehicle is disclosed. The vehicle has at least one sound output device to receive an output of at least one audio signal transmitting device. A display device has a plurality of display modes. A first button group (254) includes four first buttons arranged in a generally circular pattern. At least one second button (256, 258) is arranged in proximity to the generally circular pattern. One of the second buttons selects a display mode of the display device. The first button group controls the output of an audio signal transmitting device associated with the selected display mode. An output of the sound-producing device associated with the selected mode is transmitted to a driver via the at least one sound output device. One of the second buttons changes a function of at least one of the first button group.