Hot sale 12V lould electric car horn ISO9001 and 3c certification 115db-118db Hot sale 12V lould electric car hornISO9001 and 3c certification115db-118db1,signal mode;metal hit2,sound transmission;sound transmits along the striang line,the structure of horn prevents the sound to diverge.3,advantages;the sound is resounding ,with good penetrability,commonly used in warning the distant drivers4,it ...