Kepo minature buzzers 400hz kepo kpmb g2212l k6406 the kepo miniature buzzer 400hz is an electronic buzzer that offers a quality pulse tone when energised by a 12vdc rated voltage outputs of up to 80db12vdc20cm can be achieved suitable for use in professional commercial and industrial applications kepo kpmb g2212l k6406 miniature buzzer 400 hz