Now many people are equipped, or more precisely, they complement their entrance doors with tracking cameras, intercom and some other equipment, which by the way works from electricity.
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In this connection, it is very vulnerable before the attack of thoughtful attackers, because there are frequent cases when thieves are turned off before starting penetration into the home. Yes, that there can be turned off the light and simple electricians for any technical reasons, for example, to eliminate problems.
In general, in any case, video intercoms and all modern systems that allow you to see guests without opening the door depend on electricity, which is not to say about the good old door eyes that serve the owners around the clock.
Door eyes have long been an integral element of doorbells. The eyes are installed or at least have the ability to install in absolutely all types of entrance doors. And even elite doors are no exception.
The design of the door eye is quite simple and consists of a metal cylinder into which several lenses are placed. By the way, the number of lenses may vary from two to three and even four. It is also important to note that there are exceptional door eyes.
For example, bulletproof eyes, whose lenses are made of particularly durable glass, there are even video pins, they can be called a disguised video camera, because a person who approached the door will most likely will not guess that a video camera is installed instead of a regular eye, instead of a regular eye,.
The most important indicators you need to look at when choosing a door eye is the number of lenses, a viewing angle and a feature of the location of the lenses.
The simplest and cheap eyes have a 120 -degree viewing angle as for the best models, then their viewing angle is 180 degrees.