... JGY-103, 12V/24V,JGK-503VALVE,copper coil, w/aluminium red pipes ,Dual tone electric air horn One pair JGY-103 ... -503VALVE,copper coil,w/aluminium red pipes ,Dual tone electric air horn Product features: 1, horn sound quality good, frequency extremely stable2 ... JGY-103, 12V/24V,JGK-503VALVE,copper coil, w/aluminium red pipes ,Dual tone electric air horn