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System menu description
1. Press and hold the [FUNC] button to enter the system menu;
2. Press the [VM] and [PRE] buttons to move through the menu items;
3. Rotate the main control knob to select the required function parameter;
4. Press the [CMP] button to save and exit, or the [AGC] button to exit without saving
The various menu functions are defined as follows:
Hand mic up/down button function setting
Hand mic F1 button function setting
Hand mic F2 button function setting
Screen backlight brightness setting
ACC port input audio volume setting
ACC port output audio volume setting
Current firmware version number
NB: Handle = hand microphone