The building code requires at least a pinhole of a window through your front door, but most are not equipped to getting a glimpse of a sly menace who can evade the view of most lenses. You'll be drilling a much larger opening in your entrance with the installation of the PEEP Rotating Door Peephole, but the security it may afford is totally worth it.
This large fish-eye lens is enhanced with a mirror and a generously wide bore for plenty of visibility. From the inside of your home, you're able to turn this contraption around in order to establish sight lines that are perpendicular to your gaze. The PEEP Rotating Door Peephole will show you what's down the hall, on the floor and even at the ceiling.