Samsung SM-R720 User Manual page 22

Basics
Selecting an item
Rotate the bezel to highlight the item you want to select and then tap the item. When you
rotate the bezel, the highlight indicator will move in the same direction.
Adjusting the input value
Rotate the bezel to adjust the volume or brightness. When adjusting the brightness, rotate
the bezel clockwise to make the screen brighter.
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