The full face tempered glass is a full coverage tempered glass, specially designed to protect your mobile phone screen from scratches and other damages. In case the phone is dropped, it does not guarantee that the screen will not break as well, but it provides additional protection. It does not affect the screen's functionality. The black border covers the entire surface of the screen, including the edges. It is 3D, which means it has undergone special processing to have curved edges that cover the entire surface of the mobile phone screen. This way, it is not noticeable that the screen has protection, and additionally, the curved edges are also protected. It is compatible with the Huawei P40 Lite.