It was easy to use. Just make sure there is no fine dust on the lens. After cleaning it with a wet and dry cloth, I would recommend blowing air slowly to make sure nothing is left on the lens. Protects the lens from scratches. It's good if you don't have a case or a case that sits flush with the lens protrusion. If your case is thicker/taller than the lens, a screen protector is probably not necessary.
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