The Wolo 416 is a super loud, air powered two tone horn. With the throw of a switch you can change the sound of the horn from a “Steady Blast” to a “Euro Emergency Vehicle HI/LO” sound. The two (2) trumpets are metal, chrome plated and will look great in any engine compartment. Comes with a heavy-duty compressor, 30-amp relay, hose, toggle switch and mounting hardware. Instructions in English / Spanish.