Peephole

A peephole in a door is a device that allows to recognize someone at the door without having to open it.

The peephole increases as the presence of so-called protection secure homes because present inhabitants according identify a visitor through the peephole have a better basis for deciding whether they want to open the door.

In the simplest case, this is the peephole to a mounted at eye-level hole in old doors often provided with a flap to close. Better door viewers have a special wide-angle lens, which on the one hand the detection angle increases up to 200 degrees, and on the other, looking into it more difficult from the outside to the inside.

Door viewers are mainly used in multi-family dwellings wide distribution, so that today almost every home has one. Alternatives to the peephole door are chains or locking clip. In order to identify visitors before the outer door of a house, as well as intercom systems, and increasingly systems are used for video surveillance.

Except for the protection of residential premises door viewers are also used:

• In cell doors of the prisons, so that the guards can see prisoners without opening the cell door
• In safety-related areas, such as access to a bank vault, in the money or transportation to the police

Door Viewers can pose a security risk if they can be unscrewed from the outside. Using an opening tool can operate the door handle through the hole. Also, can peer with the aid of optical devices from the outside through the lens.

• Safety Technology
• Door component
• Door Accessories