Rivco Magnum Electric Horn Set Features: With an output of 118 decibels, they are the loudest electric horns you can buy Not quite as loud as air horns, but still 3 times louder than most stock horns This is a direct replacement for most 12-volt stock horns Set includes two chrome finish horns (one high and one low note), mounting brackets and installation instructions Get maximum volume with use of the 30-amp electric relay Zz38170