Variable distance sensor security devices and systems

A system for controlling the distance and direction of readability of a wave, the system comprising:

• a casing device comprising at least one wall having an outer surface and an inner surface defining a chamber, the at least one wall having at least a first wall portion and a second wall portion, wherein at least the first wall portion includes an electrically conductive material, and wherein at least the second wall portion defines an aperture extending from the outer surface to the inner surface, wherein a first amount of electrically conductive material included in a first portion of electrically conductive material of one of the first wall portion or the second wall portion is different from a second amount of electrically conductive material included in a second portion of electrically conductive material of the one of the first wall portion or the second wall portion, wherein the first amount and the second amount are greater than zero, wherein the first portion of electrically conductive material reduces the readability of a wave signal transmitted through the first portion of electrically conductive material to a first minimum distance, and the second portion of electrically conductive material reduces the readability of the wave signal transmitted through the second portion of electrically conductive material to a second minimum distance, wherein the second minimum distance is greater than the first minimum distance;
• and
• a transmitting device disposed within the chamber, wherein the transmitting device is capable of transmitting the wave signal.