PF15.4W fits widescreen laptop computers with a 15.4-inch diagonally measured viewable screen. Actual filter dimensions are 8.18-inch high x 13.09-inch wide. This filter is designed for widescreen laptop computers with screens that appear more rectangular than square. Keeps information confidential even in high traffic areas such as airports, airplanes, internet cafes, and other public places. Laptop privacy filters keep confidential and private information safe from prying eyes. Utilizes 3M's microlouver privacy technology so only persons directly in front of the monitor can see the image on screen. Passersby see only a dark screen. Reversible for either glossy or matte screen finish. Reduces reflections when used with the matte side facing you. Helps protect fragile LCD screens from scratches and damage. New easy on easy off attachment system. Filter stays in place even when laptop is closed.