Kepo piezo transducers 28 42 05khz range kepo kpi g2210l 6252 the kepo piezo transducer 42 05khz 22mm is able to generate a continuous tone when energised by a 12vdc rated voltage outputs of up to 85db12vdc30cm can be achieved suitable for use in professional commercial and industrial applications kepo kpi g2210l 6252 piezo transducer 42 05 khz 22mm