Incorporates all the performance and safety-driven features of world-famous, industry-leading RIVCO air horns Give any motorcycle an edge in rider-protecting sound and riding style Distinctive satin black finish 128 dB (4x louder than most electric horns) Will fit on any Harley with a left-side horn mount Air horns give a loud warning blast of 128 dB Uses the stock horn button Can be easily installed in 20-30 minutes Completely waterproof No hole drilling is required with bolt-on, plug-in installation Cone-shaped covers are included which mount to the front of the trumpets Two-year unlimited warranty All kits include two horns, air compressor, relay, simple wiring Complete installation instructions Replace the stock horn Compressor is either mounted under the seat, behind right-side cover or on down tube of frame Air compressor creates instant air pressure to the horns 2 year manufacture warranty