Feature: 1. Wide Application: Our air horn is designed for external use and is available for 12‑24V power systems, which is very suitable for cars, trucks, boats, trains and etc. 2. Stable Performance: Our 4 trumpets horn is made from stable and tough zinc alloy, and the surface is brightly polished and will not rust, suitable for all weather. 3. Super Loud: This air horn has 4 trumpets and can produce the sound as loud as 150DB. The great sound effect can blare out powerful warning and catch everyone's attention, which is very practical. 4. Durable Serving: This air horn is made to ensure maximum strength and sturdy performance, which is durable and portable. 5. Convenient to Use: The installation process is easy and quick, and the kit includes basic mounting hardwares, no complicated drilling or tools is required, which is both time saving and effortless. Specification: Item Type: 4 Trumpets Air Horn.Material: Zinc Alloy Power: 30W Current: 10A Operating Voltage: 12-24V Working Pressure: 0.8-0.9MPA Operating Frequency: 500-800HZ Fitment: Suitable for vehicles with air pump source Package List: 1 x Horn1 x Pack of Accessory (10PCs)