Quad 4 Trumpet 149DB Loud Train Black Air Horn with 1 Gallon Tank and 150 PSI 12V Air Compressor Full Onboard System Kit for Car Truck Boat 4 Trumpets 149DB Air Horn, 1 Gallon(3 liter) Air Tank with 150 PSI 12v Air Compressor Thermal Overload Protection Made of metal, Black Painted to withstand all weather conditions This air horn system will produce a loud train sound at 149db, and surely will get anybody's attention around you Suitable for Cars, Trucks, SUV, RV and Boats, Pick-ups, Marine use and more