Adjusting The Volume; Last Number Redial - Plantronics DISCOVERY 640 User Manual

ANSWERING AND
ENDING CALLS
1. To answer a call, briefly press the Call
Control Button or the Volume/Mute Button.
2. To end a call, briefly press the Call
Control Button.
If the Headset is in the Headset Carrying
Pocket when a call is received, the Carrying
Pocket will vibrate. Removing the Headset from
the pocket will answer the call.
Returning the Headset to the Headset Carrying
Pocket will end the call.

ADJUSTING THE VOLUME

To increase the listening volume of the
Headset, press the upper end (+) of the
Volume/Mute Button.
To decrease the listening volume, press
the lower end (-).
USING THE MUTE
To turn the mute on while on a call, press
both sides of the Volume/Mute Button
simultaneously until you hear a beep.
To turn the mute off, press both buttons again.
MOVING OUT OF RANGE
As the Headset is moved away from the mobile
phone or Bluetooth device,
• Audio quality will be impaired
• A beep will be heard in the Headset
• Only the Power Off function will operate
After 30 seconds, the Headset will make one
attempt to reconnect to the phone or device.

LAST NUMBER REDIAL

To activate last number redial, double click the
call control button. You will hear a high tone for
each key press.
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