Filter out Blue Light (380nm-490nm wavelength) and relieve computer eye strain to help you sleep better. Actual Screen Protector dimensions are 23 inches measured diagonally. 20 inches width x 11.3 inches high. Please compare your monitor to our measurement picture before purchasing Easy to apply and remove. Guarantee Bubble Free Installation. This package includes 2 screen protectors and an installation kit. Helps reduce glare and mirror-like reflections which makes your screen easier to use in high-glare situations.