Feature: 1. A full train horn system, designed with 3 trumpet, super loud and clear sound, easy to draw pedestrians' attention. 2. Completely made of metal, it can withstand all weather conditions to the greatest extent and ensures a long service life. 3. Including a 1 gallon air tank, 150PSI 12v air compressor, pressure gauge, pressure switch, hose, fittings, horn button and mounting hardware. 4. Wide application, suitable for all vehicles with a 12V system, can be used for car, truck and train, etc. 5. Provided complete indispensable mounting accessories, easy to install, bring much convenience for you. Specification: Item Type: Horn Kit Material: Zinc Alloy + Aluminum Alloy Trumpets Length: Approx. 11.5in, 9in, 6-1/2in, 3-3/4in Speaker Specifications: 3 trumpet black Horn Structure: Metal Structure Horn Accessories: 12V electric air valve (solenoid valve) with compression accessories Tank Capacity: 1 Gallon Air Compressor Pressure: 150psi Power Input: DC 12V 0-150 PSI pressure gauge 90 ON / 115 OFF PSI pressure switch 30A online fuse with built-in fuse 1/4in OD nylon plastic hose (6 feet) 1/4in NPT compression connector Horn button Brass drain nut. Package List: 1 x Triple Trumpet Train Air Horn (Black) 1 x Air Tank Assembly (with Pressure Switch and Pressure Gauge) 1 x Black Air Hose 1 x Horn Button Bag (Screws x 2) 1 x Fuse Seat with Wire 1 x PTFE Tape4 x Black Screw 1 x Siren Mounting Accessory Pack