Features: 1.Blue Ray Blocking: This screen protector panel can filter out harmful blue ray waves from 380 to 420nm and 99% UV. Protecting your eyes and skin from the negative effects of harmful light overexposure. 2.Designed for 27in Monitor: This desktop monitor protector is specially designed for 27 inches(612.6 x 356mm / 24.1 x 14.0in) PC monitor. 3.High Transparency: This PC monitor protector adopts premium acrylic, which ensures high transparency, protecting your screen from scratches and dirt. 4.Hanging Type: This widescreen monitor filter can be easily installed. Peel the protective film away from both sides, then hanging it on monitor. 5.Wide Application: This PC monitor filter is perfect for students, OL, game players and programmers in the office and home, no more worries about eye strain, blurred eyesight and headaches. specification:Item Type: Screen Protector Panel Material: Acrylic Application: For 27 inches(612.6 x 356mm / 24.1 x 14.0in) PC Monitor Inbuilt Battery of Light: 30mAh Filter Wavelengths: 380 to 420nm Blue Ray (Beneficial Light is Not Filtered), 99% UV Blocking PackageList:1 x Screen Protector Panel 1 x Tool Kit 2 x Paster 1 x Blue Ray Testing Card 1 x Blue Ray Light