No impairment of display visibility and touchscreen functionality. You will hardly notice any difference compared to a Huami Amazfit Bip S without a screen protector. Scratch-resistant due to the specially hard-coated surface! Very resistant to scratches and abrasion! 4H pencil hardness. Intentionally smaller than the Huami Amazfit Bip S glass, as it is curved, bubble-free, and can be removed without residue at any time (no adhesive). Extremely easy to install! 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.