Loud 135DB Triple 3 Trumpet Train Air Horn Black 1 Gallon Tank 150 PSI 12V Air Compressor Full Onboard System Kit Car Truck Boat 1 Gallon(4 liter) Air Tank with 150 PSI 12v Air Compressor Loud Triple Trumpet Train Air Horn is entirely made of metal, Black Painted to withstand all weather conditions Thermal Overload Protection This air horn system will produce a loud train sound at 135db, and surely will get anybody's attention around you Suitable for Cars, Trucks, SUV, RV and Boats, Pick-ups, Marine use and more