2. Return to the menu button at the next higher level, and press this button to return to the menu at the next higher level.
3. Volume adjustment button to increase and decrease the volume.
4. The left and right adjustment keys are used to operate the multi-function display screen to jump left and right.
5. Press the main menu key to return to the main menu.
6. Turn on the phone button.
7. Call back key.
8. Put the voice button on the phone.
9. Turn on the cruise control key.
10, cruise speed increase or decrease key.
1 1. Cancel the cruise control key.
12, update the key.
13, menu up and down adjustment key.