Geemarc CLEARSOUND CL100 Mode D'emploi page 11

Bass
+10db max
Note: When the tone (treble), earpiece volume
and sending levels are set to the maximum,
whistling may occur. Then the sending level
settings should be decreased with the switch
When the switch
ON, the extra-receiving and tone functions are
automatically activated each time you use the
phone.
When this switch is OFF, you will need to activate
the function by pressing the button
Tone and volume (15dB to 30dB) adjustment is
only activated when the button
When this button is set to OFF only the volume
can be adjusted from 0dB to 15dB.
Volume and tone adjustment
TONE
Normal
located behind the phone is
11
Treble
+10db max
.
is set to ON.
.