A case for a mobile electronic device includes an aperture configured to receive one or more earbuds, a portion configured to receive power from a power source, and circuitry configured to simultaneously charge the one or more earbuds and the mobile electronic device. The method includes the steps of providing a conductive substrate, forming a cavity space in the conductive substrate, and forming an insulation layer on the conductive substrate. The system further comprises a crosspoint switching matrix means for receiving encoded signals from the plurality of encoders and for providing encoded signals to a plurality of receivers. Embodiments of the invention may utilize scaleable architectures to process any number of users andor recipients. The electronic switch of the shunt branch is connected in series and the electronic switch of each outlet branch is connected in parallel. The driving transistor is formed by the second electrode, the second dielectric layer, the first semiconductor layer, the source electrode, and the drain electrode.