Tempered glass is a hardened glass, specially designed to cover and protect your mobile phone screen from scratches and other damages. It does not affect the screen's functionality. In case of a phone drop, it does not guarantee that the screen will not break along with it, but it provides additional protection. It has adhesive on its entire surface, unlike edge glue glasses that have adhesive only on their perimeter. This helps in better fitting and smooth operation of the touch screen. It also prevents dust from getting underneath, which can happen with edge glue when the perimeter adhesive wears out. It is compatible with the Galaxy A13.