Symbol Technologies MC9000-K - Manual (Page 436)

MC9000-K/S for Embedded Windows® CE .NET Product Reference Guide B-26
Table B-3. MC9000-K: 43-Key Functions
Local Function Key Sequence
Display Backlight On/Off
Keypad Backlight On/Off
Contrast + <Func><F1>
Contrast - <Func><F5>
Volume + <Func><F4>
Volume - <Func><F8>