Will keep dust, mud and snow from accumulating in the audio jack.
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The audio jack cover is a rubber plug that prevents water and dust from entering the headset jack when not in use. A short tether prevents the cover from being misplaced when a headset is in use.
Please note that the Audio Jack Cover is not required to keep the unit sealed against dust and water. Rather, it is intended to keep dust, mud and snow from accumulating in the jack.
This is a standard accessory included with each Ranger 3 computer. It is a consumable accessory that can wear out in normal usage.