In accordance with an example embodiment of the present invention, an electronic device is configured to provide a tactile cue associated with a feature. The fiber optic module assembly has a fiber pigtail exiting module, the assembly includes a main body of the module defining an internal chamber disposed between a first side and a second side, a plurality of fiber optic components disposed at the first side of the module, and a fiber optic harness including the fiber pigtail. The gate patterns have different lengths in the central region, the intermediate region, and the outer region. The first control unit 401 generates sawtooth wave voltage and controls the inverter 301 according to the sawtooth wave voltage. The building block is shaped to interlock with other building blocks.