COOCHEER Train Air Horn Kit, Loud Horns 4 Trumpets 100 PSI 12V Compressor Tank Gaug (Black) Multi-Fitment: This train horn kits are suitable for almost any vehicle, such as: cars, trains, trucks, boats,tractors, RVs, buses, etc. Weather Resistant: The Coocheer dual horn is metal chrome plated material and is designed to be weather resisant, enough to withstand the any weather Simple and Easy to Install:The air horn is easy to install, it's flexible and portable, so it's easy to move from one car to another Compact Air Horn: Coocheer 4 Trumpet Air Horn Kit Made of superior quality zinc material and chrme-plated metal, small but powerful, designed for weatherability to withstand any weather Complete Package: All of our specialized compressor kit complete with a 12 volt compressor, air tank, pressure switch and mounting hardware. These compressor kits are built for performance and easy installation. Make you horns really sing!