Wolo (417) Long Horns Big Rig Sound - 12 Volt, Low and High Tone Produces a powerful "Big Rig Truck Sound" These horns are the perfect choice for any 12-volt vehicle Kit has two durable red plastic trumpets Easy to install in all vehicles with Wolos new compact chrome plated compressor, that is maintenance free Kit includes a heavy-duty compressor, 30-amp relay, hose and mounting hardware