Tone and volume adjustment
1-RECEIVING VOLUME AND TONE ADJUSTMENT
You can adjust the receiving volume and tone according to your own hearing requirements.
The button 
allows extra volume and tone functions to be activated or deactivated during the conversation.
Tone and volume adjustment (15dB to 30dB) is only activated when the switch 
located at the upper side of your phone is set to ON. When this button is set to OFF only the volume can be adjusted from 0dB to 15dB.
When the function is activated, the red light of extra
receiving and tone function button 
is lit.
Note: When the tone (treble), earpiece volume and sending levels are set to the maximum, whistling may occur. If whistling occurs the sending level settings should be decreased with the switch 
.
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