Extremely Loud Train Horn: Upgraded interior structure and air compressor can produce more volume sound, to drive more smoothly and safely on the road, and avoid accidents. As the sound is really loud, please use it reasonably especially in schools, hospitals | Complete Kit for High Performance: With all the durable accessories you need, you can replace the stock horn to get enough attention from people, or install it to the car roof and hood, even your motorcycle (make sure you have the ability or go AUT store) | Fits on Any 12 Volt Vehicle, like Car, Truck, SUV, Motorcycle, Yacht, Boat, off Road Vehicle, Buses etc., Please note that existing original air supply device or 24V power supply is not available (you need to buy the version with solenoid valve) | Committed to 100% Satisfaction: Any concerns or questions if you meet about products please contact us, all Carfka products come with a 30-day money back, 1-year warranty and lifetime support | Easy to install: Chrome Plated ZINC Trumpet, upgraded air compressor, All-copper coil, hose, Relay Wiring Kit (12v 40a), Built-in fuse, the truck air horn is easy and safe for installation