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