The full face tempered glass is a full coverage hardened glass specifically designed to protect your mobile screen from scratches and other damages. In case of a fall, it does not guarantee that the screen won't break, but it offers additional protection. It does not affect the screen's operation.
The black border covers the entire surface of the screen, including the edges. It features adhesive across the entire surface, unlike edge glue glass protectors which only have adhesive along the perimeter. This helps ensure better application and seamless touch screen functionality. Additionally, it prevents dust from entering underneath the glass, which can happen with edge glue protectors when the perimeter adhesive wears out.
It can be removed at any time without leaving marks or causing problems to the screen.