... 4,MOQ;1000pieces High Quality SWT Piezoelectric Diaphragm for External Drive Main feature of Piezo Ceramic Element ... (Piezoceramics element; Piezo diaphragm, piezo plate)1, For sound making:Clocks,Calculators,Telephones,Washing machines,Various(Burglar alarms ... ,etc);2, For transduction: Embryo monitor,Heart reflectoscope reflector,pedometer, car ...