Kensington SA215 Privacy Screen for iMac 21.5"Protect sensitive information and preserve your productivity with the Kensington SA215 Privacy Screen designed for the 21. 5" iMac. This privacy filter uses a precision engineered two way privacy design to narrow the viewing angle so only someone directly in front of your screen sees the content clearly. Off angle viewers see a darkened, unreadable image, helping to prevent shoulder surfing in busy offices, cafes, or shared workspaces. The SA215 is