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Adjust the TONE and VOLUME buttons to fit the levels to your own hearing
requirements.
2 - SENDING VOLUME LEVEL ADJUSTMENT
If your voice is quiet or called parties have difficulty hearing you, you can
increase the sending level volume with the switch located on the upper
side. You can also decrease the sending volume if required.
Min Normal Maxi
TONE
Bass
+10dB max
Treble
+10dB max
Normal
Volume
+20dB max
Normal
0dB
15dB
15dB
OFF
35dB
ON
VOLUME AND TONE ADJUSTMENT