Feature: 1. Super Loud : Super loud 135DB sound. The sound could spread a far distance, please do not use it near school or hospital. 2. Four Trumpets: The 4 trumpet horn is designed for customers looking for a loudand affordable air horn. It is enough for everyday use. 3. Durable Material: Made of high‑quality metal materials, it has super durability, wear resistance, corrosion resistance, and anti‑dust, anti‑vibration, and anti‑moisture. 4. Wide Application: Designed for exterior mounting on any 12V vehicles, trucks, SUVs, RVs and boats motorcycles etc. 5. Easy Installation: Installation is simple. This horn is equipped with a 12V solenoid valve, hose and mounting hardware. Its operation requires an onboard air system. Specification: Item Type: Air horn Material: Metal Color: Black Working Voltage: DC 12V Working Current: 4A Sound Output: 135dB Operating Air Pressure: 0.5Mpa-1.0Mpa Application: Designed for any 12V vehicles, trucks, boats, motorcycles, etc. . Package List: 1 x Air horn(4 Trumpet Tubes)1 x Hose1 x Bracket4 x Screw4 x Nut4 x Gasket