The present invention is a closed loop system of heat recovery in hot dry rock or in water-containing formations for generation of electrical power. The gaming system is configured to establish a secure communication session between an electronic gaming machine and a portable electronic device. The light travels inside the guide and exits through its distal end first exposing a standard substrate. The aim of the invention is to provide a device and a method, which combine, in a simple and economic manner, the advantages of gas inlet systems, such as an active intake and a concealed assembly, with the advantage of the localization of each intake port as well as the detection of a precise fire source or a precise gas impurity.