Macally 4 Way Privacy Screen Protective Overlay for iPhone 4 - Black Prevents screen from being viewed by others nearby. Privacy screen works when iphone is used vertically and horizontally. Does not affect touchscreen sensitivity. Anti-smudge and glare-resistant material. Non-damaging residue free adhesive. Prevents your screen from being viewed by others nearby Privacy screen works when iPhone is used vertically and horizontally Does not affect touch screen sensitivity Anti-smudge and glare resistant material Non-damaging residue free adhesive, easy application