Samsung BHM1000 - Manual (Page 19)

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English
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.
Placing a call on hold
Press and hold the Talk button to place the current call on hold.
When the headset is connected with two phones, this function is not available.