Clear-Com CellCom Battery Pack Charger - Manual (Page 135)

Clear-Com Communication Systems
CellCom V2.0.3 Instruction Manual
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MASTER VOLUME CONTROL
The master volume control is set from the main menu.
Press and hold both scroll buttons until the main menu is displayed.
Select the Master Level and adjust the slider using the left/right scroll
buttons until the required volume is obtained.
Press the centre button to exit the master level and use the scroll
buttons to exit the main menu back to the display page.