Symbol Technologies MC9000-K - Manual (Page 416)

MC9000-K/S for Embedded Windows® CE .NET Product Reference Guide B-6
Table B-1. MC9000-K: 28-Key Functions
Local Function Key Sequence
Display Backlight On/Off <Func><#>
Keypad Backlight On/Off <Func><0>
Contrast + <Func><1>
Contrast - <Func><4>
Volume + <Func><3>
Volume - <Func><6>