❤Style 1：(Vehicles need have air source) Package Included: 1 *Air horn 1 set of mounting hardware ❤Note: Solenoid valve: Air Horn this type, Vehicles need have air brake or air source then can use this type horn, please pay attention Specification: Suitable for: Any 12V vehicles, trucks, vans, buses and boats Material: high quality chrome stainless steel horn (no rust) Voltage: 12V • Powerful - although it is a small air horn, it provides a very loud sound. It produces the same loud sound as the 328DB. The powerful voice caught the attention of everyone. • Superior quality - The single speaker is made of high-quality materials to ensure maximum strength and durability for long-term use. The single corner is sturdy and made of sturdy material to withstand any weather and form of snowstorm. • Affordable - The single speaker is designed to find customers who are loud and reasonably priced. The build quality is very good, very affordable, and the price is very affordable. • Easy to install - Single speaker is easy to install. It is flexible and portable so it can easily react from one car to another. The horn kit includes basic mounting hardware and hoses. ❤Style 2：(No need have air source) Package includes: 1 electric horn 1* electric horn 1 set of mounting hardware ❤Note: No need for a compressor or hose, a simple two-wire connection Feature: Durable and portable Good sound, no vibration High temperature and pressure changes Suitable for cars, trucks, boats, motorcycles Simple installation No compressor or hose required, and maintenance free Low current high decibel This horn has good sound and extremely stable frequency Product specifications: Material: all metal Color: silver Power supply: 12 Single speaker Bright white polished finish Maximum rust protection Maintenance free Suitable for ships, RVs, SUVs and trucks