Privacy Screen Uses A Micro-Louver Technology That Darkens The Screen View From The Sides (+/- 30 Degrees From Center) - Designed To Fit Laptops With 12.5" 16:9 Display; Does Not Interfere When Closing The Lid - Share The Screen With Someone Next To You By Flipping The Filter Up, Without Removing It Completely - This Laptop Privacy Screen Blocks Up To 51% Of Blue Light - Use The Included Adhesive Strips Or Flip-Up Tabs To Install The Screen Protector