... -102-2,12V/24V,JGK-505valve with aluminum coil/JGK-502 valve with copper coil,Dual tone electric air horn One pair JGY ... -102-2,12V/24V,JGK-505valve(with aluminum coil)or JGK-502 valve(with copper coil) raised base cover,Dual tone electric air ... hornProduct features: 1, horn sound quality good, frequency extremely stable2, long service life, price ...