Feature: 1. Dual tone air horn, with waterproof compressor, including 4‑pin relay. Applicable to any 12‑volt system, widely used for cars, trucks, motorcycles, , RV, etc.2. Eliminates the sound loss by attaching the compressor using a bolt on design, an intermediary unit is between the sound unit and the compressor allowing for vibration absorbing so sound integrity is not lost. 3. 125dB sound level, 600Hz frequency, twice the sound of factory speakers, no need for air pipes or external air supply, stable performance. 4. Made of premium quality aluminum alloy and ABS, it has maximum rust protection, corrosion‑resistant and durable. 5. One-piece design, with no hoses needed, compact in size, can be installed in a few minutes by using a single bolt of the factory speaker cable. Specification: Item Type: Car Air Horn Size: Approx. 12.07 x 7.62 x 11.43cm / 4 3/4 x 3 x 4 1/2in Package List: 1 x Air Horn 1 x Relay 1 x Relay Wire 1 x Gasket 1 x Screw |