Tempered glass is a hardened glass specially 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 a fall, it does not guarantee that the screen won't break along with it, but it provides additional protection. It is 2.5D, which means that its perimeter has rounded edges for a smoother feel when touching the screen. Useful for modern smartphones with curved screens. It is compatible with the Poco M4.