BLUE LIGHT & ANTI-GLARE EYE PROTECTION: Not only will your filter protect your login and other data from prying eyes, it reduces harmful blue light by 60%. And its 3H hardness rating also provides a layer of physical protection to your screen. EASY INSTALLATION: It's a snap to apply your Akamai privacy cover. We use the highest quality 3M adhesives to ensure long lasting protection. We've included full installation instructions so you'll have no problem applying the filter to your screens. Dark Screen For Others -- Clear view for you. The computer privacy filter makes the screen appear dark when looking at it from an angle (the angle is about 30°- 60°), but bright when looking directly at it. To change the privacy angle from 60° to 30° degrees - simply adjust your monitor’s brightness level. JiSiTeCai - Privacy Products: Do not expose personal or business data to snoopers. If viewed from the side, these privacy filters will darken your LCD screen while giving you a clear view across the entire surface. Keep your computer safe with these industry-best protectors. Privacy filter size 17" (5:4) - if the active area of the display has the following dimensions: Width: 13 5/16" (13.3"/339mm), Height: 10 5/8" (10.6"/271mm) - Aspect ratio 5:4, then this filter is for you.