CD tray Display OK button In radio/CD/MP3/USB/iPod mode: Starts/cancels Scan function. In menus: Selects menu item. AUDIO button Calls up audio menu for sound settings. DIS-ESC button Exits the menu and changes to the display of the (10) audio source, selects display modes (e. MP3 browse mode in MP3 display). button (hang-up button) Rejects an incoming call/ends a call. Arrow keys In menus and radio mode: Selects submenus and menu items/functions. In other operating modes (e. CD or MP3 mode): Selects track, CD and directory. Alphanumeric keys Radio mode (0 ­ 9): Selecting stored stations (press short), storing stations (press for longer than 2 seconds). In menus: Entering, for example, PIN codes, phone numbers and names ® In Bluetooth mode: Enters, saves and calls up phone numbers. On/Off button / Volume control Short press: Switches the device on. In operation: Mutes the device (Mute). Long press: In operation: Switches the device off. button (answer button) Makes or answers a call. SOURCE button Selects the audio source. MENU button Calls up a menu...