Features 1、Anti Peeping: Install the computer private screen filter, the screen front is visible in a 60 degree viewing area, making the screen content clearly visible from the front but dark from the sides (30° to 60°). It effectively prevents office colleagues from peeking and leaking office data. Always protect your information. Ideal for use in airplanes, subways, airports, and public places. 2、Blue Light and UV Proof: The computer blue light blocking screen filters harmful blue light with wavelengths between 380 to 420nm. Advanced blue light blocking technology protects your eyes, sleep, and skin from the negative effects of overexposure to blue light. The screen protector also filters out 99% of harmful UV rays to reduce eye fatigue. 3、High Light Transmittance: Compatible with 27 inch (612.6x356mm) computer display. The light blocking protector is made of high light transmittance acrylic, effectively preventing screen dust and scratches. Great for students, office workers, gamers, and programmers at home or in the office. 4、Reduce Eye Fatigue and Improve Sleep: Enjoy your digital time without worrying about eye strain, blurry vision, and headaches. Provide blue light blocking for your eyes and protect your health for better sleep. 5、Easy Installation: Very easy to install, simply remove the thin film from both sides of the computer screen protector, then install the protector on the display after cleaning. No glue, no bubbles. It can also be removed and hung on another computer for use, not disposable. Specification Item Type: Computer Screen Protector Material: Acrylic Suitable for: 27 inch (612.6x356mm/24.12x14.02in) computer Spy Proof: Left and right 30 degrees non visible Lamp Built in Polymer Lithium Battery: 30mAh Light Filtering: 380 to 420nm blue light (does not filter beneficial light), 99% UV proof Package List 1 x Computer Screen Protector 1 x Blue Light Lamp 3 x Buckle 1 x Cleaning Cloth 1 x Blue Light Test Card 4 x Protective Case