Samsung HM1800 用户手册

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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.

Press the Talk button to end the first call and answer a second call.

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Press and hold the Talk button to place the first call on hold and answer a second 

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call. To switch between the current call and the held call, press and hold the Talk 

button.