1、Anti Peeking: The front of the screen has a 60 degree viewing area, which will appear dark when viewed from the sides of the computer, effectively preventing office colleagues from peeking and leaking office data. 2、Blue Light Blocking: Computer blue screen protector filters harmful blue light with wavelengths between 380 to 420nm, which defend your eyes, sleep and skin from the negative effects of excessive blue light exposure. 3、UV Protection: The screen protector also filters 99% of harmful UV rays to reduce eye strain, making it ideal for use in airplanes, subways, airports and public places. 4、Prevents Scratches: Compatible with 27inch (Approx. 612.6 x 356mm / 24.1 x 14in) PC monitors, it is made of highly translucent acrylic to defend against screen dust and scratches. 5、Easy to Install: Blue light screen protector is very easy to install, after cleaning the monitor just remove the film on both sides of the PC screen blue light blocker, hang the protector on the monitor, and you can remove it at any time. Item Type: 27 Inch PC Hanging Screen Protector Material: Acrylic Suitable For: 27inch (Approx. 612.6 x 356mm / 24.1 x 14in) PC Monitor Anti Peep: 30 Degrees Left and Right Unseen Light Built in Polymer Lithium Battery: 30mAh Compatible: Perfectly Compatible with for HP, for Dell, for Asus and Other Monitor Brands. Filter Wavelength: 380-420nm Blue Light (Not Filter Beneficial Light), UV 99% Protection Features: 1. Very Easy to Install, After Cleaning the Monitor Just Remove the Film on Both Sides of the Computer Screen Blue Light Blocker. Hang the Protector on the Monitor. No Paste, No Air Bubbles. Can Also Be Removed at Any Time and Hung on Other Computers to Use. 2. Prevent Eye Fatigue, CVS, Chronic Eye Damage, Eye Strain, Soreness and More Serious Eye Related Diseases 1 x Anti Peep Film 2 x Sticker 1 x Auxiliary Kit 1 x Blue Light Test Card 1 x Blue Light