Feature:1. UV Protection: The computer screen eye protector filters out harmful blue light and harmful UV light with wavelengths between 380 to 420nm2. Blue Light Blocking: Blue light blocking technology keeps your eyes, sleep and skin from the negative effects of overexposure to blue light, reducing eye strain3. 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 monitor4. Convenient and Practical: The 21.5in blue light screen protector is not easy to produce bubbles after hanging on the monitor, and can also be removed at any time and used on other computers5. Acrylic Material: The computer screen protector is 21.5in monitor compatible and is made of high light transmittance acrylic to prevent dust and scratches. For broad HEV protectionSpecification:Item Type: Computer Screen Eye ProtectorProduct Material: AcrylicApplicable To: 21.5in for IOS Desktop (Approx. 330 x 537mm / 13.0 x 21.1in)Filter Wavelengths: 380 to 420nm Blue Light (beneficial light is not filtered), UV 99% ProtectionFeatures: Easy to Install, Prevent Eye Fatigue, RGB Color Supports Self Color.Package List:1 x Computer Screen Eye Protector1 x Clean Cloth1 x Wipes2 x Anti Slip Stickers Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.