Door holes are important and necessary accessories for front doors. With their help, you can see who or what is on the other side of the opaque barrier and, accordingly, determine how to behave. By design, the device is an optical device with a wide viewing angle. Budget models allow you to see people and objects fall into a sector with a width of 120 °. Panoramic door windows (wide-angle) are considered the best, their viewing angle closely approaches 180 °, practically leaving no dead zones in front of the door.

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