1、Designed for 18.5in PC: This PC monitor protector is specially designed for laptop with 18.5 inch or 16:9 screen, ideal for students, office worker and programmer in home or office. 2、Viewing Angle Limits: The viewing angle of this laptop private screen will be limited from 30 to 60 degrees. Everything is visible only to persons in front of laptop, while people on either side of it cannot see anything. 3、Blue Ray Blocking: This laptop screen protector is designed with filter layers that can block 65% blue ray and 96% harmful lights, also resistant to dust and scratches. Reversible design gives you the flexibility to choose between smoothing or matte side, choosing matte side to reduce external glaring. 4、Easy Installation: Comes with double sided adhesive tapes, this 18.5 inch monitor filter can be easily mounted onto your laptop, or simply using the hanging method, saving your time and effort. 5、Multi Purpose: This laptop monitor filter is ideal for airports, airplanes, trains, coffee shops, office environments, financial institutions, and other public spaces.