The musical air horns from Wolo MFG come in a variety of musical tunes. They are a universal fit. There are 14 different popular tunes to choose from, select the video tab to hear samples of the tunes available. These horns are SUPER LOUD and attract attention with their 118 Decibels of power. Each unit has a heavy duty 12 volt maintenance free compressor and durable plastic trumpets, amount of trumpets depends on model. Kit comes complete, nothing else to buy. Installs in minutes by simply transferring the factory horn wires to the compressor. Instruction in English / Spanish.