The tempered glass is a hardened glass specifically designed to cover and protect your mobile screen from scratches and other damages. It does not affect the functionality of the screen. In case of dropping the phone, it provides additional protection, but it does not guarantee that the screen will not break. It is 2.5D, which means the perimeter has rounded edges for a smoother feel when touching the screen. It is useful for modern smartphones with curved screens. It is compatible with Galaxy A20s and Nokia 5.3.