This is my second of these protectors. i got a good year out of the first. Easy to apply although the QR code linked to a different product with different markings and numbers. I found another video tutorial anyway. Try to find the least dusty place, e.g. a humid place or bathroom. You cannot see the protector once it’s on, and it’s smooth to swipe around, no ridges.
Screen protector is great product.
Nice and thin and couldn’t even tell it was on after application. But the video instructions provided were incorrect and made it hard to apply.