[2 Pack] 21.5 Inch Computer Privacy Screen For 16:9 Aspect Ratio Widescreen Monitor, Eye Protection Anti Glare Blue Light Comput Network Switches and the second number (77mm)

and the second number (77mm) indicates the filter size of the accessory

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[2 Pack] 21.5 Inch Computer Privacy Screen For 16:9 Aspect Ratio Widescreen Monitor, Eye Protection Anti Glare Blue Light Comput Network Switches and the second number (77mm)Creates A Restricted Viewing Angle Of Only 60 Degrees, So Facing The Screen Can See, But Off To The Side Can Only See A Darkened Screen Reduces Harsh Blue Light For Less Eye Strain; Protects Against Dust And Scratches; Easily Attaches With Included Bezel Tabs Or Removable Adhesive Strips. To Ensure Proper Fit, Measure The Viewable Height And Width Of Your Laptop Screen. (Do Not Include The Screen Frame In Your Measurement.) Then, Choose The Filter