[99% ANTI-BLUE LIGHT] - YES2B Blue Light Cut Filter cuts over 99.99% of harmful Blue Light wavelength(380~400nm) from the screen! Also, YES2B Blue Light Cut Filter cuts UV 99% from the screen. Use YES2B Blue Light Cut Filter and protect your eyes. [WHAT IS BLUE LIGHT?] - Blue Light is the blue colored light existing in 380~500nm wavelength emitted from all LED screens. Blue Light reaches retina making weak and is one of the main cause of aging eyeball.[BEST FIT WITH 19"] - YES2B Acrylic Blue Light Cut Filter Hanging Type could be easily used with multiple sizes of monitors. [Available Size] - 17inch Square(5:4), 17inch Widescreen(16:10), 17.3inch Widescreen(16:9), 18.5inch Widescreen(16:9), 19inch Widescreen(16:10), 19.5inch Widescreen(16:9) [Actual Filter Dimension] - Width : 17.01 inch (432mm), Height : 11.22 inch (285mm).[EASY INSTALLATION] - Just 1 sec. for installation. Simple and easy to install without using any adhesive. Just hang over the top of the monitors bezel, easy to take on and off.[EXCELLENT COLOR TRANSMITTANCE & ANTI-SCRATCH] - YES2B Blue Light Cut Filter provides excellent color transmittance and clear view. Also, YES2B premium filter protects your screen from scratches.[PACKAGE CONTENTS] - Each package includes 1pc of Blue Light Cut filter, 2pcs of Rubber Pad, Cleaning Cloth, Manual. We guarantee best quality! Buy YES2B Acrylic Blue Light Cut Filter Hanging Type and protect your eyes. Product Description 1 FIND CORRECT SIZE 2 HOW TO INSTALL 3 BLUE LIGHT TEST 4 UV & BLUE LIGHT CUT 5 ANTI-SCRATCH Track Page Views WithAuctiva's Counter