Logitech NuLOOQ - Manual (Page 7)

limits your access to the tooltuner dial and the built-in triggerpoints.
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Using the navring
The navring is a gentle moveable gray ring encircling the device. This ring can be moved in all horizontal directions and
twisted, as shown in animated image below. Keep in mind that the device is not intended to move. Only the navring
slides, while the device is stationary.