User's Manual Part 1

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Adjusting the Audio Volume
To increase the audio volume in the loudspeaker
To decrease the audio volume in the loudspeaker
The display looks like this when adjusting the volume:-
Selecting a Channel
Using Channel Up/Down Keys
Pressing the channel up or down key will select respectively the next higher or
lower programmed channel. Holding down either of the keys will cause the rate of
the channel change to increase.
The channel up/down keys on the microphone have the same function as the
channel up/down keys on the keypad.
Channel up
Channel down
Note:- The microphone up/down buttons needs to be configured for channel
change function either when programming the transceiver or in the “General”
section of the protected menu.