Samsung BHM1200NBACSTA - Manual (Page 20)

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Options available during a call
You can use the following functions during a call.
Adjusting the volume
Press the Volume up or down button to adjust the volume.
You will hear a beep when the volume level of the headset reaches it's lowest or highest level.
Muting the microphone
Press and hold the Volume up or down button to turn the microphone off so that the person with
whom you are speaking cannot hear you. When the microphone is turned off, the headset beeps
at regular intervals. Press and hold the Volume up or down button again to turn the microphone
back on.
Transferring a call from the phone to the headset
Press the Talk button to transfer a call from the phone to the headset.