1PRECISE SIZE: The computer private screen perfectly fits 21.5 inch computers, with 16: 9 aspect ratio, 475mm width, 268mm height. Unique double sided structure, glossy surface has better anti peeping effect. 2ANTI GLARING: The frosted surface is made of premium anti glaring technology, which reduces glaring by more than 90 degrees and softens the light, thus you won't feel harsh reflections in bright light environments. 3ANTI BLUE LIGHT: Computer private filter is made of imported optical material, which can reduce 92% of blue light and 98% of UV rays, filtering all the harmful light emitted from the screen and protecting your eyes. 4HIGH DEFINITION: This computer private filter protective film has a highly transparent reinforced built in protective layer, which not only presents high definition picture quality, but also guards your screen from scratches. 5INCREASED SECURITY: With the computer screen private filter, the data on the screen is only visible to the individual sitting in front of the screen, making the screen appear dark when viewed from an angle (30 for each angle, 60 for both).