Samsung GH68-12948A - Manual (Page 17)

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Press [Volume Up] on the side of the headset to increase the
volume level and [Volume Down] to decrease the volume level.
Press and hold [Volume Up] or [Volume Down] to switch off the
headset's microphone. To switch it back on, press and hold
either one again.
If you answer the call with your phone, you can transfer the call
to the headset by pressing the Multi-Function button.
Adjusting the volume
At very high volumes, prolonged listening to the
headset can damage your hearing.
Switching on the microphone
Transferring a call from the phone to the
headset