How to Use: Install and use it. Specification: Item Type: Car Display Screen Protector Material: Tempered Glass Hardness: 9H Type: Meter Tempered Film and Navigation Tempered Film Thickness: Approx. 0.26mm/0.01in Applicable Screen Size: 12.3 Inches Scope of Application: Compatible for Mercedes Benz S Class 2014-2017 12.3 inches Package List: 1 x Meter Screen Tempered Film 1 x Navigation Screen Tempered Film 2 x Film Application Tool Note: 1. Please check your car configuration before ordering, if the navigation display is not LCD, the additional wet pad may damage your screen. Thanks!2. Manual measurement, please allow some errors.