Feature: 1. COMPATIBILITY: This blue light blocking film is suitable for 21.5 inch computer screens with 16:9 aspect ratio, wide compatibility for multiple computer brands. 2. REDUCES EYE FATIGUE: Our anti blue light screen protector filters up to 61% of blue light and up to 99% of UV. By reducing exposure to UV and blue light, it effectively reduces eye fatigue and discomfort. 3. ANTI BLUE LIGHT: It has a 5 layer design that reduces the effects of blue light waves from 420‑460 nanometers. Optically transparent adhesive layer and at least 85% transmittance ensure image clarity without pixelation, effective anti reflection and anti glare. 4. PROTECTIVE FUNCTION: It can protect your screen from scratches and grime, prolonging the life of your screen. As the outer layer of your screen, our computer screen protector keeps it from dust. With soft microfiber cleaning wipes for your cleaning convenience. 5. EASY TO INSTALL: It is mounted by electrostatic adsorption, eliminating the need for messy tapes or complicated installation procedures. Easily uninstall or reinstall our anti blue light screen protector whenever you need it. Specification: Item Type: Computer Blue Light Blocking Film Material: PET Product Size: Approx. 475x267mm / 18.7x10.5in Applicable: For 21.5 Inch 16:9 Screen. Package List: 1 * Computer Blue Light Blocking Film1 * Tool Kit