A door viewer, or peephole, is a miniature security device attached to a door that permits some view of those outside without the door being opened. Usually containing a round fisheye lens, door viewers also provide some interior view even in dim light. Door viewers may be typically of brass or stainless steel with varying finishes such as chrome, gold, or antique. Door viewers are intended for private homes and apartments, hotels, and offices where privacy and safety are the concern. Very easy to install and inexpensive, door viewers are a simple yet great way to enhance security in doors.
Benefits:
1) Heightened Security - Allows for sight of visitors without door opening.
2) Panoramic View - Grants vision of the outside clearly and broadly.
3) Easy Installation - Easy and fast to install in any door.
4) Cheap Means of Ensuring Safety - Cheap and effective.
5) Protection of Privacy - Keeps unknown visitors at a distance.