A method and system for detecting obstacles in a user’s path by obtaining the user’s location and direction of movement, as well as visual and audio inputs of the surrounding environment, and alarming the user if the method and system detect an obstacle approaching the user. The system has a housing with a thin opening along its length and two ends along its width. Links with play are envisaged between each of the coupling rods and the attachment fitting, to ensure transmission of thrust forces in the event of rupture of one of the parts of the device. At least one linear nylon support strip is connected at each lateral side of the seating implement backrest and extends laterally across a back portion of the seating implement backrest. Three-dimensional patterns may be formed in a photoresist layer of the target in a single patterning step.