The full face tempered glass is a full-coverage tempered glass screen protector, specially designed to protect your mobile screen from scratches and other damages. In case of a fall, it cannot prevent the screen from breaking, 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 its entire surface, unlike edge glue protectors that only have adhesive around the perimeter. This helps with better application and hassle-free touch screen operation. Additionally, it prevents dust from getting underneath, 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 issues to the screen.