Dust collection portions are installed at both ends of a holding plate installed on a shield plate of a charger. The conformal EMI shield includes a thermally conductive dielectric coating adhering directly to surfaces of the printed circuit board to provide an electrically nonconductive, thermally conductive, contiguous coating that covers all such printed circuit board surfaces. Accordingly, a vibration system of a wind-bell having a tone determined by many factors such as a fundamental tone, harmonic tones, lingering sound, and fluctuation assists high frequency vibration propagated from the audio device.