Wolo (619) Big Bad Max Air Horn - 12 Volt Sound chamber designed to create a deep big rig sound, two times (2X) louder than a factory horns Perfect choice for all 12-volt vehicles: cars, trucks, motorcycles, boats, etc The one-piece patented design requires no hoses like conventional air horns Easily installs with one bolt that is provided, transfer the vehicles factory horn wires to Big Bad Maxs compressor and the installation is complete Built with a heavy-duty compressor that is maintenance free assuring years of dependable service