The full face tempered glass is a full-coverage hardened glass designed specifically to protect your phone's screen from scratches and other damages. In case your phone drops, it may not prevent a broken screen, but it provides additional protection. It does not affect the functionality of the screen.
The black frame covers the entire surface of the screen, including the edges. It has adhesive across the entire surface, ensuring better application compared to edge glue glass protectors, which have adhesive only along the perimeter. This prevents dust from penetrating under the glass, which can happen with edge glue protectors when the perimeter adhesive wears out.
The protector can be removed at any time without leaving marks or causing damage to the screen.