The utility model relates to a portable electronic device. The portable electronic device includes: a bottom wall and a side wall cooperating with the bottom wall to define a cavity, the side wall having an edge defining an opening introduced into the cavity; a protective layer covering the opening and encapsulating the cavity; visual subsystem, and a depth map positioned within the cavity and between the protective layer and the bottom wall and operable to provide a depth map of an object external to the protective layer, vision subsystem comprising a carriage assembly, the carriage assemblyis arranged to carry optical components cooperating to provide information used to generate a depth map, the bracket assembly includes a first bracket arranged to carry and maintain the optical components at a fixed distance from each other, and a second bracket having a body secured to the first bracket, the second bracket having a protrusion extending away from the body.