IOGear GBHFK231 - Manual (Page 24)

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Adjusting the
Volume Press the “+” or “-“ button repeatedly until you reach the
desired volume level.
Mute Short press the Mute button during a call to mute and the
RED LED will turn on.
Un-Mute Short press the Mute button during mute mode to un-mute
the Car Kit and the RED LED will turn off.
Transferring Call
from Car Kit to
phone Press both “+” and “-“ during a call to direct the call from
the Car Kit to cellular phone.