Targus 4Vu Privacy Filter Screen for 17.3-Inch Widescreen (16:9 Ratio) Monitors (ASF173W9USZ) Protects private information with constrained viewing angles to 30 from either side Blocks screen glare for a comfortable viewing experience; filters Blue light, minimizing eye strain Over 12% brighter than competitive solutions for greater clarity and visibility Glossy or matte sides to suit your viewing preferences Reusable silicon adhesive strips for quick and Easy Installation Limited warranty does not cover products purchased from 3rd party sellers