Kepo piezo transducers 57mm diameter kepo pct g5700 6319 the kepo piezo transducer 2 4khz 57mm is able to generate a continuous tone nature when energised by a 12v peak square wave also allowing an output of 100db12vp p33khz10cm kepo pct g5700 6319 piezo transducer 2 4 khz 57mm