The SA27 Privacy Screen Filter for iMac 27" helps protect your privacy, simply and easily. A washable, reusable adhesive makes installation – and re-installation – simple, with no unsightly bubbles. Protects privacy by limiting viewing angle to +/- 30°. Reduces harmful blue light by up to 22%, diminishes glare, improves clarity and protects from scratches and damage. Includes cleaning cloth and protective case to help prevent scratches when not in use.