This 4 trumpet air horn kit includes four horns, a solenoid valve, a 0.8-gallon air tank, a compressor, and air pipes. It's easy to install under your car and features an auto-inflating compressor for quick horn response. Made with rust-proof, anti-leakage materials, it's perfect for long-distance driving, ensuring safety in any weather and effectively alerting others on the road. | Vevor | | Train Horns Kit,4 Trumpet Air Horn Kit, 150dB Train Horns for Pickup Trucks, 12V 120 psi Air Compressor 0.8 Gal/3 L Tank | Black | Best Buy