Privacy LCD Screen Protector Film For Apple iPhone 4 4G Protect your Cell Phone's LCD screen against dust and scratches and eliminate glare. Anti-Scratch Film: thickest and most durable. Privacy Effect: LCD screen will be completely black when viewed from left or right at a 30 degree angle. Ultra Smooth Surface: Enhance the experience and utilization of touch screen and stylus features. NOTE: Please do not perform installation in a dusty environment.