1. Out of the box, the Horn Blasters Conductor's Special model 240 came with everything we needed to accomplish a horn ready to turn the volume up to 11. Seen here are the four high-impact horns, 2-gallon air tank, Viair 400C compressor, and pressure switch. Not shown but included in the kit were the required wiring, electric solenoid valve, air line, mounting hardware, and earplugs. Our kit was $579.99.