The Powerful 150DB loud is designed for customers looking for a loud and affordable air horn. Our air horns kit is suitable for all 12V Vehicles Trucks Trains Boats Cars, which can deliver the big sound you need! Why choose the CARFKA dual trumpet Air Horns for Cars? 1. Great Trumpet air horn designed to work on any vehicle ( Truck, SUV, Car, Boat, Or Train) that has a 12 Volt DC Power available, they cast an eye-catching appearance on any vehicle-mounted. 2. Made out of Premium High-Quality Chrome Plated ZINC Rust Free Material. Strong enough to be out on any weather and will not get damaged. 3. The specialized compressor kits will make your horns really sing. 4. Flexible, portable and easy to take between vehicles. 5. Our horn kit is very easy to install, you just need to splice a wire from the positive screw terminal to the power wires of the original horn wire or a horn switch installed on the dashboard, then splice a wire to the ground(Negative wire). Specification: Material: Chrome plated zinc Color: Silver DB Output: 150DB Voltage: 12V Short Trumpet Length: 8.9inch Long Trumpet Length: 11.8inch Package Includes: 1 X Dual Trumpet Air Horn 1 X Air Compressor 1 X Air Hose 1 X Set of Mounting Hardware 1 X Relay 1 X Wired Relay Plug Warm Tips: The train horn kits source should be directly introduced from the air reservoir to achieve better sound quality: the air reservoir must discharge water frequently to affect the service life of the solenoid valve.