Kepo minature buzzers 400hz kepo kpmb g2303l1 k6348 the kepo miniature buzzer 400hz is an electronic buzzer that offers a quality pulse tone when energised by a 3vdc rated voltage outputs of up to 75db3vdc20cm can be achieved suitable for use in professional commercial and industrial applications kepo kpmb g2303l1 k6348 miniature buzzer 400 hz