Inside mounting air horn with chromed grille and exceptionally powerful sound. The main innovation is the compressor which is built-in with the trumpets and allows the immediate emission of the sound when pressing the push button. It is no longer necessary therefore the use of an air tube. The grille is in ASA with thick chromium plating class III and stainless steel bracket. Deep sound typically nautical. The inside mounting is fast and easy. The horn is suitable for yachts below 39 ft in length, rubber boats, transport and working boat, patrol boat.