No impairment of display performance and touchscreen functionality. You will hardly notice any difference compared to a Sony Alpha 7R IV without a screen protector. Scratch-resistant due to the special hard-coated surface! Highly resistant to scratches and abrasion! 4H pencil hardness. Compatible with Sony Alpha 7R IV. Excellent quality ensured by the use of state-of-the-art precision machinery (laser cutting technology) - optimal edge adhesion, very good shape stability. Easy installation! No bubble formation possible on a dust-free display! When applying the film, the air is displaced and it adheres to the display almost by itself. Can be removed at any time without leaving residue! Made in Germany - construction, cutting, and finishing at fair wages in Germany.