D-Link DWR-720P - Screen Background Light; Adjust the Volume

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2.1.5 Screen Background Light
 Background light illuminates the screen.
 When you power on your phone, the background light will turn on for a predefined period.
 If no key is pressed within the period, the background light will turn off automatically to save battery life.
To adjust background light brightness and period:
 For Time (sec): [Menu]  [Settings]  [2.Display]  [2.Backlight].
You can now select between: Always on, 30, 20, 15, 10, 5 secs
 For Brightness: [Menu]  [Settings]  [2.Display]  [3.Contrast].
You can now press the left or right arrow keys to adjust the brightness down or up.
2.1.6 Adjust the Volume
During a call:
 Press [Up Key] to increase the volume of the handset or hands free (HF)
 Press [Down Key] to decrease the volume of the handset or hands free (HF)