The Wolo 417 produces a powerful "Big Rig Truck Sound". These horns are the perfect choice for any 12-volt vehicle. Kit has two (2) durable red plastic trumpets. Easy to install in all vehicles with Wolo's new compact chrome plated compressor, that is maintenance free. The kit includes a heavy-duty compressor, 30-amp relay, hose and mounting hardware. Long Horns will provide years of dependable service. Instructions in English / Spanish.