1. ANTI BLUE LIGHT: Computer screen protectors filter harmful blue light with wavelengths between 380nm to 420nm. It protects your eyes, sleep, and skin from the negative effects of overexposure to blue light. 2. PROTECTIVE: The blue light blocking screen protector is compatible with 21.5 inch (476x268mm) desktop computer screens. Made of highly translucent PET, it effectively protects against screen dust and scratches. 3. EYE PROTECTION: You don't have to worry about eye fatigue, blurred vision, and headaches with this PC screen blue light filter film. Protection for your health. Suitable for students, gamers, and programmers. 4. EASY TO INSTALL: Very easy to install the PC screen protector film and no bubbles. Simply remove the film on both sides of the PC screen blue light blocker after cleaning the screen and attach it. 5. UV FILTERING: This PC screen protector film also filters 99% of harmful UV rays. To reduce eye strain. Used for a wide range of HEV protection. Ideal for computer use at home or in the office. Item Type: PC Screen Protector Material: PET Product Size: 21.5 inches (Approx. 476 x 268mm / 18.7 x 10.6in) 1 x PC Screen Protector 1 x Dust Cloth 2 x Adhesive 12 x Double-Sided Sticker