Horns require a minimum of 80PSI to operate at full capacity. 

All metal bracket, solenoid assembly and back plate. The Trumpets themselves are plastic. 

These horns are designed to be a vehicle enhancement for show use. They should be installed on a dedicated isolation switch and able to be turned off.

These horns output a massive 170 decibels of noise, we do not recommend standing too close to them. As a point of reference a Military jet aircraft take-off from aircraft carrier with afterburner at 50 ft is 130 decibels. At 150 decibels there is a possibility of eardrum rupture.

True 2 tone sound, just like a train.

Horn comes with one year, return to base warranty. Limited to the parts only.

Scope of supply as shown in picture.