The photo-devices with pulse and synchronized infrared beams create an invisible and discreet barrier, because fastened to an aluminum structure placed inside the polycarbonate body with standard diameter for sustenance of the lighting bodies. In fact, thanks to the different types of sealing covers, it is possible to finish off the poles with the various models of lighting bodies available on the market. This and other special characteristics have rendered the product patented on a European level.The electronics allow to discriminate at onset the passage of small animals; alternatively, it is possible to command the exclusion of the first two rays at a distance (alarm control unit).The number of double TX and RX beams, their rotation by 180° horizontally and by 20° vertically, placed in a single column, allow to achieve protection, following any type of geometric shape of the site.