Unused. LOE Surface Laptop 6 / 5 / 4 / 3 / 2 [13.5 inch] Privacy Screen Protector 【Magnetic】 Privacy Filter Blue Light Cut Anti-Glare (Surface Laptop 4) 1 piece [Privacy Protection] With a viewing angle of 60 degrees, the screen is clear when viewed from the front, but appears completely dark from adjacent seats. This privacy filter utilizes polarization. [Magnetic] Nano-suction material is attached to the bottom edge of the filter, and a magnetic plate is attached to the top. Simply align the filter with the screen and gently trace the top and bottom with your finger to easily attach it. You can easily remove the filter at home and attach it when you're out and about. *Please note* Overlapping with anti-glare films or glass films is not recommended. Please remove the film you are currently using or consider using a glare film that is not fluorine-coated. [Blue Light Reduction & 99.9% UV Cut Rate] Blue light emitted from laptop screens, which we didn't have when we were children. Highly toxic blue light is increasingly concerning for eye strain and its impact on the body's rhythm. This product reduces blue light by approximately 50% while providing a privacy effect. If you're thinking about the future, a blue light cut film is recommended. [Low Reflection] With a reflection rate of 5.8% and anti-glare, there is almost no light reflection. You can use it stress-free even in bright places. [Compatible Models] Surface Laptop 4 (Also compatible with 13.5-inch Surface Laptop 1/2/3 of the same series.)