Features: 1.Anti Blue Light: Hanging type PC screen protector can filter harmful blue light with wavelengths between 380?420nm, and can also filter 99% of harmful UV rays, reducing eye fatigue. 2.Eye Protection: Blue light blocking screen protector panel prevents eye strain, CVS, chronic eye damage, eye strain, soreness and more serious eye related diseases. 3.High Light Transmittance: Blue light screen protector is compatible with 21.5inch PC monitors, and has a wide range of compatibility for most brands of computers. 4.Multi Purpose: PC screen filter film is made of high transmittance acrylic, which can effectively prevent screen dust and scratches, suitable for students, OLs, gamers and programmers' offices, at home. 5.Easy to Install: Just remove the film on both sides of the blue light blocker on the computer screen after cleaning the monitor, suspend the protector on the monitor for use, or take it off at any time for easy use. specification:Item Type: Hanging Type PC Screen Protector Product Material: Acrylic Scope of Application: 21.5 Inches (Approx. 288 x 491mm / 11.3 x 19.3in) PC Monitor Filter Wavelengths: 380-420nm Blue Light (Beneficial Light is Not Filtered), UV 99% Protection PackageList:1 xHangingTypePCScreenProtector 1 x Dust Free Cloth 1 x Wet Wipes 1 x Dust Stickers 2 x Anti Slip Stickers