Features: 1.HEV Protection: The blue light computer screen filter filters harmful UV rays and harmful blue light with wavelengths between 380 to 420nm for a wide range of HEV protection 2.Blue Light Blocking: Blue light blocking technology keeps your eyes, sleep and skin from the negative effects of overexposure to blue light, reducing eye strain 3.Easy to Install: The blue light computer screen filter is easy to install, just remove the film on both sides of the blue light blocker on the computer screen after cleaning the monitor 4.Convenient and Practical: The blue light screen protector is not easy to produce bubbles after hanging on the monitor, and it can also be removed at any time and used on other computers 5.Scope of Application: The computer screen filter is compatible with 23.6 to 23.8in PC monitors. High light transmittance acrylic material can effectively prevent screen dust and scratches, suitable for office, home specification:Item Type: Computer Screen Eye Protector Product Material: Acrylic Suitable For: 23.6in to 23.8in (Approx. 543 x 316mm / 21.4 x 12.4in) PC Monitor, Compatible with for HP, for Dell, for Lenovo, for Asus, for LG, and Other Monitor Brands Filter Wavelengths: 380 to 420nm Blue Light (beneficial light is not filtered), UV 99% Protection Easy to Install, Prevent Eyestrain PackageList:1 xComputerScreenEyeProtector2 x Anti Skid Stickers1 x Cleaning Cloth