PYEPYD Anti-Blue Light Screen Protector for Samsung Galaxy S4 UV Filter HD Clear Anti-Scratch Premium Quality Film - Saves Your Eyesight from Harmful UV Ray and Blue-Light

Installed with zero issues (air bubbles, alignment issues, etc.) and appears to be working perfectly. Without a light meter, I have no way of evaluating whether the filter claims are valid. There is a discernable difference in tone between the white border of the screen and the small area around the top sensors on my Galaxy S4, which aren't fully covered by this shield. Judging by that, I would guess it is caused the blue filter of this shield and therefore validates is claim as such.It is worth mentioning that there is a cut out on the top of this shield which leaves the one sensor on the left of the earpiece as well as two of the three sensors to the right of the earpiece completely uncovered, as well as a small notch for the face camera. Other shields I've used had holes for each sensor and the earpiece individually. This design does make alignment more forgiving, though I personally preferred the other design because it covered more of the glass.

This when on easly because I watched the video. Caveat is, I don't like the blue screen in the sunshine.

Would buy again :)

I bought this for my S4. It didn't fit my phone. I had to cut it down to size. Then I placed it on the phone. Bubbles EVERYWHERE. I tried the replacement, cut it down to size, same problem. Then the cover scratched when I tried to push the bubbles off.

Though I have no way to test the blue light blocking efficiency, I like the product and it fits the phone perfectly.

The screen protector was easy to apply and hardly had any bubbles. I love it