Motorcycle 118 Decibels Magnum Electric Horn Set - Frontiercycle (Free U.S. Shipping) With an output of 118 decibels these electric horns are the loudest you can buy, over three times as loud as most stock horns and economically, a great choice. The set includes two horns (one high and one low tone) with smooth chrome finish, mounting brackets and installation instructions Horns measure 3 x 3 x 3 each. For easy installation select from one of the mounting hardware and plug & play wiring kits. A direct replacement for most 12-volt electric horns. 12 Volt Electric Horn Set Will Work On Any 12 Volt System (Motorcycle, Automobile, or Boat)