To adjust the speaker volume:
Press speaker!
Then up / down on the circle buttons!
The volume will be saved at level selected
To adjust the handset volume:
Lift the handset!
Then up / down on the circle buttons!
The volume will be saved at level selected
To adjust the LCD contrast:
With the telephone on-hook!
Press up / down on the circle buttons!
The contrast will be saved at level selected
To adjust the ringing volume:
While the telephone is ringing!
Press up / down on the circle buttons!
The volume will be saved at level selected