Judas optics with silvered mirror - enables one to see through door or window without being noticed

摘要

The device enables the viewer to see outside a door or window without being seen and without attracting attention and is commonly known as "Judas optics". It comprises a mirror without a base, or a silvered glass (3), placed in a tube (1) which is inserted in a hole in the door. A nut (4) enables the tube (1) to be attached to the door or window. The external attachment may be disguised by incorporating it into the design or decoration of the wall, door or window framework fittings.