It doesn't affect the brightness at all when viewed from the front,just the same as if there is no privacy screen before.You can adjust the screen brightness as needed.Privacy screen protector is made of adsorption layer material, easier to install, if it is not very stable, you can add transparent stick tabs on the sides and corners to hold it in place. Laptop privacy screen filter is the ideal solution for open office settings, universities, financial institutions, health care providers, and corporate travel.Protect your privacy anywhere!. Compatible with macbook pro 14 inch(A2442) privacy screen protector not only offers privacy, also protects your eyes from harmful glare, UV, and blue light.Resistant to scratches, oils and fingerprints. Viewing angle is darker from ±30°,the greater the angle the darker the screen becomes,at the end the screen goes completely black. Note: the screen is clearly visible in the front. Privacy screen filter specially designed for MacBook pro 14 inch M1 2021(A2442).Please check your laptop model before purchg.