The Euro Emergency Vehicle Horn is a practical and reliable product designed to enhance the safety of emergency vehicles. With its 2-tone horn and 120-decibel sound, it ensures maximum attention on the road. The horn can easily switch between a steady blast and the distinctive Euro emergency vehicle hi/lo sound. Featuring 2 chrome-plated trumpets and a middle range frequency of 540/660 Hz, this horn fits most makes and models. Each purchase includes a heavy-duty air compressor, relay, hose, and all necessary mounting hardware. Trust this horn to deliver the necessary alertness and functionality for emergency vehicles.