To protect your information, the Targus 27\" Apple Thunderbolt Display Privacy Screen features tiny vertical blinds that narrow the viewing angle to 45 degrees. Onlookers will only see a dark unclear screen when attempting to view the information from a side angle. In addition to providing security, the screen also blocks the glare to help reduce eye strain. The Targus Laptop Privacy Screen can be easily attached by using clear adhesive strips designed for LCD filters or with the included tab guides that stick to the edge of the LCD bezel to hold the screen in place. Users can also position the tabs so the screen easily slides on and off. Highly portable and easy to use, the Targus Privacy Screen prevents onlookers from viewing valuable information viewed on a laptop or LCD monitor.