Kepo piezo transducers 28 42 05khz range kepo kpi g2312l 6259 the kepo piezo transducer 33 05khz 23mm is able to generate a continuous pulse tone when energised by a 9vdc rated voltage outputs of up to 88db9vdc30cm can be achieved suitable for use in professional commercial and industrial applications kepo kpi g2312l 6259 piezo transducer 33 05 khz 23mm