This horn, suitable for a variety of 12.0V/24V cars, ships, trains, etc, can effectively alert pedestrians and vehicles, improve safety. Features: Widely applicable, most of the 12.0V and 24V car models can be applied, compatible with large trucks, buses, mining cars, also suitable for some ships, trains. Three-tube design, improve efficiency, sound more loud. The sound is loud and the frequency is stable, which can effectively warn pedestrians and vehicle and increase the driving safety. It is made of fine-quality materials, not easy to rust, not easy to deform and has long service lifes. It is easy to install and operate. Specifications: Sound: 6 sound effect, 8 sound effect (optional) Material: metal Main color: silver+black Horn diameter: 90mm Horn length 262mm+300mm+341mm Item size: 394 * 258 * 100mm / 15.5 * 10.2 * 3.9in Item weight: 1739g / 3.8lb Package size: 400 * 280 * 110mm / 15.7 * 11.0 * 4.3in Package weight: 1978g / 4.4lb Note: This product needs to be used with horn compressor. Packing List: 1 * Car Horn 1 * Set of Installation Tools