Unique car horns that can be heard several kilometers away. The horns have stainless steel internal parts combined with a fiberglass-reinforced ABS plastic body. This construction makes them extremely durable and reliable in all conditions. Each horn installs separately, allowing for flexible placement on the vehicle. The kit also includes everything needed for installation. They are powered by a 1.5 gallon air system with 120 pounds of pressure. This is enough for 2-3 seconds of sound. Everything you need to connect is included, which is the horns themselves, wiring, compressor, air receiver, etc.