The structural carrier assembly is installed in a motor vehicle front or rear end. The device may reside in a PC or on a network interface card for providing an interface between the PC and a network, such as an Ethernet-based network. Then, an oscillation frequency of a periodic oscillation, which is generated in the motor at the sensed rotational speed of the rotor, is obtained. The phase of a first optical signal is modulated in dependence on the third data signal, and the phase of a second optical signal with a same wavelength is modulated in dependence on the fourth data signal. Optional features could include a led lighting and vocal effects. An adhesive layer is positioned on the foil layer, and a first photo-definable hydrogel membrane is positioned over the electrode layer and the adhesive layer.