A laminated piezoelectric element according to the present invention includes a plurality of unit laminates and a plurality of adhesive layers. The invention uses a first channel and a second channel to send same packet encapsulating same target data to a receiving end. The method can etch the subject layer using the resist as a mask and with a gas containing a halogen element, which is introduced into a processing chamber. A high frequency voltage is then applied between the active electrode and one or more return electrode. Another aspect of one embodiment of the invention utilizes DMA-based hardware to select which pin groups should received \u201cfanned-out\u201d test data. In particular, the present invention provides methods and devices for stimulating structures of the ear via multiple signal transducers.