An adjustable insulation apparatus attaches to a garment to manage the body heat of the user. Electrodes are provided on the transverse members at least at its ends and at the center at which the vertical bar crosses the transverse member. A reader-and-writer unit is housed in the accommodating section. To represent a bit, one of the reflective tones in the subband is randomly chosen. It is made in one piece from an overmoulded plastic material that forms the body, reinforced by a reinforcing strip comprising a woven band of mineral and plastic material fibers, the reinforcing strip extending in the general plane of the frame and interconnecting at least two of the functional components comprising inserts at least partially embedded in the body. The lighting unit can emit light at a distance from the electrical wire of the lighting string that provides a special lighting effect with improvement.