The “MODE” button is used to select the preferred audio mode. Each time it is pressed, the mode will change to the next one in the following sequence:

Type A, B, C and D audio:

Models with Hands-free system

Press and hold this button if you wish to immediately cut the volume to zero.

The audio display will show “MUTE”.

If you press and hold the button again, the original sound volume will return and “MUTE” turns off.