Feature: 1. The complete train horn system is ready for installation. Includes a 1 Gallon air tank, 150 PSI 12 volt air compressor, pressure gauge, pressure switch, hoses, accessories, horn button and mounting hardware. 2. High quality zinc alloy and aluminium alloy material, is durable, sturdy, hard, and wear‑resistant and corrosion resistant, provides the best protection in all weather conditions. 3. 4 Trumpets, wih high sound quality, more in line with your needs, provide a effective protection. 4. Can be used for trucks, cars, trains and pickup loud systems, which is very practical and convenient. Suitable for all vehicles equipped with 12V system. 5. Manufactured to meet or exceed standard specification, strictly follow factory quality control. Specification: Item Type: Train Air Horn Kit Material: Zinc Alloy + Aluminum Alloy Color: Black.Trumpet: Horn Horn Size: 4 Sound Type: Train Power Supply: 12V Size (L x D): Approx. 13-3/4in (34.9cm) , 11-1/2in (29.2cm) , 9in (22.9cm), 7-1/2in (19cm) x 3-3/4in (9.5cm)Air Tank Length: Approx. 38cm/15in Compressor Power Supply: 12V Maximum Pressure: 150 PSI Maximum Current Consumption 18Amp Flow (0 PSI): 1.17 Air Tank Capacity: 1 Gallon Working Pressure: 115 PSIDescription: The whole car horn system is ready to be installed. At the heart of this package is the fierce four-horn air horn, which draws immediate attention. Black is the main color and is completely made of metal for maximum protection in all weather conditions. The system includes a 1 gallon air tank, a 150 PSI 12 volt air compressor, pressure gauge, pressure switch, hoses, fittings, horn buttons and mounting hardware. Suitable for all vehicles with 12V system. A bold, resounding choice. Package List: 1 x 4 Trumpet Train Air Horn Assembly (4pcs Horn Tube, 1 Base)1 x Air Tank Assembly (with Pressure Gauge)1 x Black Air Hose1 x Horn Button (with Screw)1 x Fuse Holder with Wire1 x PTFE Tape4 x Black Screw1 x Horn Screw Installation Kit