Waterproof dual-trumpet air horns give a loud warning blast of 128 dB Include horn assembly, air compressor, relay, simple wiring, cone-shaped dust/bug covers, mounting hardware and complete installation instructions Air horns mount to the frame down tubes or engine guards; air compressor mounts to the frame behind a side cover or under seat Use the stock horn button; bolt-on, plug-in installation. HORNS AIR UNIVERSAL