Feature:1. Blue Light Filter Film: The 20 inch screen protector effectively filters out harmful blue light with wavelengths between 380420nm. Advanced blue light blocking technology protects eyes, sleep and skin from the negative effects of excessive blue light exposure.2. Great Fit: Compatible with 20 inch 16:9 (442x249mm) desktop computer screens. The blue light display screen protector is made of highly translucent PET, which effectively prevents screen dust and scratches. Great for students, OL, gamers and programmers in their office/home.3. Protect Your Eyes: Enjoy your digital time without worrying about eye strain, blurred view or headaches. Improves sleep, blocks blue light and protects eye health. Blocks 99 percent of harmful lightreduces eye fatigue and provides extensive HEV protect.4. Easy Installation: 16:9 anti blue light screen film is easy to install without air bubbles. Simply clean your display and peel off the film on both sides of the computer screen blue light blocker. Easy to stick on the screen.5. Reduce Eye Fatigue: Anti blue light screen film can reduce eye fatigue, block blue light, protect eye health. Reduces eye fatigue caused by prolonged exposure to digital screens. Enhances overall eye health and comfort.Specification:Item Type: Anti Blue Light Laptop Screen ProtectorMaterial: PETSize: Approx. 20 inch 16:9 (442 x 249mm / 17.4 x 9.8in)Applicable Display Size: 20 inch display.Package List:1 x Screen Protector1 x Non Dust Cloth2 x Adhesive12 x Double Side Tape