Feature: 1. ANTI BLUE LIGHT: Computer screen protector filters harmful blue light with wavelengths between 380nm to 420nm. It guards your eyes, sleep and skin from the negative effects of blue light overexposure. 2. PROTECTIVE: The blue light blocking screen protector is compatible with 21.5 inch (476x268mm) desktop computer screens. Made of highly translucent PET, effectively guards against screen dust and scratches. 3. EYE PROTECTION: No need to worry about eye fatigue, blurred vision and headaches with this PC monitor blue light filter film. Protection for your health. Suitable for students, gamers and programmers. 4. EASY TO INSTALL: Very easy to install the PC monitor protective film and no bubbles. Simply remove the film on both sides of the PC screen blue light blocker after cleaning the monitor and stick it on. 5. UV FILTERING: This PC screen protective film also filters 99% of harmful UV rays. To help reduce eye fatigue. Used for a wide range of HEV protection. Ideal for house or office computer use. Specification: Item Type: PC Monitor Protector Material: PET Product Size: 21.5 Inches (Approx. 476 x 268mm / 18.7 x 10.6in). Package List: 1 x PC Monitor Protector1 x Dust Cloth 2 x Adhesive 12 x Double Sided Sticker Note: Manual measurement, please allow some errors.