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 <#>
Keypad Backlight On/Off <0>
Contrast + <1>
Contrast - <4>
Volume + <3>
Volume - <6>