No impairment of display quality and touchscreen functionality. You will hardly notice any difference compared to a Ulefone X back without a display protector. Scratch-resistant due to the specially hard-coated surface! Highly resistant to scratches and abrasion! 4H pencil hardness. Intentionally smaller than the Ulefone X back glass, as it is curved, bubble-free, and can be removed without residue at any time (no adhesive). Easy installation! No bubble formation possible on a dust-free display! When applying the film, air is displaced, and it adheres to the display as if by itself. Can be removed without residue at any time! Made in Germany - construction, cutting, and finishing at fair wages in Germany.