Amazon.com: GUMIKE Anti Blue Light Screen Protector for 21.5 Inches (21 Amazon.com: 21.5 Inch Anti Blue Light Monitor Screen Protector, Blue Amazon.com: MOSISO 23 24 inch Computer Blue Light Blocking Screen pixelRo Anti Blue Light monitor Protector. YouTube. Description: 1. Material: PC 2. Application: laptop, desktop 3. Size: 21. 5"(500 x 303 mm) 4: Ratio: 16: 9 5. Installation: Hanging Features: 1. Inclination installation. The hook design allows a heat dissipation gap between the protective screen and the display, which solves the heat dissipation problem caused by radiation wave refraction and reduces the effect of radiation wave refraction on the display effect 2. Anti Blue Light. Intelligently filter the short wave high energy blue light of the LED screen from 400nm to 480nm, so that the eyes are not affected by the blue light. 3. Anti radiation. Filter strong light, in addition to electrostatic magnetic field, blocking UV, effectively protecting the human body, eyes, skin. 4. High Definition. High luminous transmittance does not affect the viewing. 5. The protective film is made of polyethylene, fingerprint and oil stain resistant, which is durable and protects your computer screen from scratches. 6. Hanging Style Installation. No adhesives or tapes required, just hang the filter on your monitor. The filter can be easily taken on and off when not in use. Notice: The size here indicates the screen's size, which does not include rim. Packing List: 21. 5" filter x 1 pc