Windshield Mount Includes a Semi-Sticky Gel Ring On the Cup Surface Helps the Provide Dramatically Improved Performance Greater Surface Adhesion and Attachment Force to the Windshield Easy to Use and Fits All Grades and Slopes of Automotive Windshield Glass Rotating Knob Adjusts the Angle to Match the Pitch of the Windshield Once Set the Mount Permanently Mirrors with the Windshield Slope.