Difficult installation. Carefully stick the protective film on the speaker and apply the glue until there are only 2 drops left in the bottle, because unfortunately it has more than necessary inside, so if you put it all, it will overflow! However, doing the above correctly is not enough... I ended up with an air bubble when I put the glass on the glue, resulting in a very bad appearance like a burnt pixel! I was thinking maybe it really is a burnt pixel and I didn't notice it!!! I endured for 2 weeks and removed it, realizing that it was fortunately an air bubble and that it greatly reduces the image quality!!! It was truly shocking how much it affected the colors and brightness! I experienced the wow effect again that I had when I first saw the phone up close! So for me, it's not worth it, I won't put it again and I will try to be very careful about how and where I touch it!