In a door, usually for apartments or hotel rooms, a peephole allows the person behind the door the security of seeing outside without opening the door. Glass peepholes are often fitted with a fisheye lens to allow a wider field of view from the inside and little to no visibility from the outside.
A one-way wide angle viewer, also known as a peephole viewer, is a device that is typically installed on the door of a residence or commercial building, allowing the person inside to see who is outside without opening the door. It is a type of security device that allows the person inside to identify who is at the door before opening it. The one-way viewer typically consists of a lens on the outside of the door and a viewer on the inside. The lens captures a wide-angle view of the area outside the door, which is then displayed on the viewer inside. The viewer is one-way, meaning that people outside can’t see inside, it’s a security feature. These types of viewers are commonly used in residential, commercial and industrial buildings, and they come in a variety of styles and finishes.
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