No impairment of display representation and touchscreen functionality. You will hardly notice any difference compared to a Garmin Vivoactive 4s (40mm) without a screen protector. Scratch-resistant due to the specially hard-coated surface! Highly resistant to scratches and abrasion! 4H pencil hardness. Intentionally smaller than the Garmin Vivoactive 4s (40mm) glass, as it is curved, bubble-free, and can be removed at any time without leaving residue (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 at any time without leaving residue! Made in Germany - construction, cutting, and finishing at fair wages in Germany.