No impairment of display visibility and touchscreen functionality. You will hardly notice any difference compared to a Xiaomi Mi Kids Watch 4 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 glass of the Xiaomi Mi Kids Watch 4, as it is curved, bubble-free, and can be removed at any time without 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 almost by itself. Can be removed at any time without residue! Made in Germany - construction, cutting, and finishing at fair wages in Germany.