Equip your vehicle with the Kleinn HK2-1 complete direct bolt-on ProBlaster dual black air horn and onboard air system, featuring two all-metal trumpets measuring 16.75 inches and 14.5 inches in length with 3-inch bell ends. Engineered for universal application, this premium truck horn configuration features a versatile flat mounting design that allows for an easy install behind the grille, inside the engine compartment, or directly onto the frame rails of almost any car, truck, or sport utility vehicle. Delivering an earth-shaking blast of up to 153.6 decibels that mimics a fire truck or ambulance horn but significantly louder, the high-performance package is powered by a Model 6270RC 130 PSI waterproof electronic air compressor paired with a compact 0.5-gallon all-steel air tank. Designed for a clean, quick, and seamless installation, this standalone package comes complete right out of the box with a pre-wired Vortex 4 Series Model 307 electronic solenoid valve, a 1/4-inch high-pressure airline, a 12-volt relay, a pressure switch, and all necessary mounting hardware to achieve maximum volume and long-lasting durability on any custom build.