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The “OK” and [Select] buttons can be used to enter menus or toggle
configuration items, and the [Back] button can be used to exit menus.
When editing a configuration item that uses a slider bar, the left and right
arrow keys are used to change the value in the slider.
Located near the directional keys are the volume control and mute buttons.
Similar to the base, the system volume can be increased or decreased using the
volume up and volume buttons, and the system can be muted using the mute
button on the dialer.
The mute/unmute button only applies during an active call. It is not applied
to the device when a call is not active.
