Samsung HM1800 - Manual (Page 19)

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English
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.
Placing a call on hold
Press and hold the Talk button to place the current call on hold.
Answering a second call
Press the Talk button to end the first call and answer a second call. •
Press and hold the Talk button to place the first call on hold and answer a second •
call. To switch between the current call and the held call, press and hold the Talk
button.