3M Privacy Filters keep confidential information private. Only persons directly in front of the monitor can see the image on screen; others on either side of them see a darkened screen. Designed to fit standard laptops with a diagonally measured 15" viewing screen and a 4:3 aspect ratio. Actual filter dimensions are 12" wide x 9" high (304 mm x 228 mm). Includes your choice of two easy-to-use attachment methods. Reversible, matte side reduces glare and reflections. Lightweight, thin, frameless design. Protects display from dirt, debris and scratches. Cleans easily with a soft cloth and water. Great for high traffic areas such as airports, airplanes, commuter trains, coffee shops and other public places.