... , calculators, telephones, electronic and toys . One.Piezo Ceramic Element Applications1. For sound making:Clocks,Calculators,Telephones,Washing machines ... alram sensorTwo.Brief description of piezo diaphragmProduct type according to drive:1,External drive;2,Self driveProduct ... diameter 8mm,Biggest is 65mm;Producttype according to type of metal plate:Brass,Nickel,Stainless steel,FerrieThree.Diaphragm ...