Feature: 1. Compatible: Laptop screen protector is 21.5 inches and is compatible with for Lenovo, for HP, for Dell, for Acer, for Samsung, for ViewSonic, and other monitor brands. 2. Secrecy Angle: Laptop screen film has a secrecy filter that makes the screen appear dark when viewed from a certain angle (approximately 30 degrees to 60 degrees). To change the secrecy angle from 60 degrees to 30 degrees, simply adjust the monitor's brightness level. 3. Eye Protection: Laptop screen protective film protects your eyes by filtering 96% of UV rays and suppressing 65% of blue light. It is a reversible secrecy screen filter that selects a matte finish to reduce external glare. The filter is anti glare and scratch resistant. 4. Easy To Install: Laptop secrecy film can be installed in about 30 seconds. Two mounting methods are offered, one using a clear adhesive strip that can be securely fastened to any monitor. The second is a removable mounting method, a snap in installation. 5. Wide Application: Laptop screen protective film is ideal for use in high traffic areas such as open work spaces, airports, airplanes, coffee shops, office environments, financial institutions and other public places to protect secrecy. Specification: Item Type: Laptop Screen Protector Material: PET Size: 21.5 inches . Package List: 1 x Laptop Screen Protector 1 x Dust Free Cloth1 x Adhesive6 x Double Sided Adhesive1 x Instruction Manual Note: Please confirm the width and height measurements of your computer screen before ordering.