Sonic blast horn features a specially formulated, nonflammable propellant for safe use where flammability is a concern. Advanced horn profile offers an improved level of sound to deliver a piercing 120-decibel blast that can be heard up to a mile over land or sea. Chrome-plated metal horn is incredibly durable for reliable performance in a variety of harsh locations. Sonic blast horn is perfect for boating & emergency alarm stations, construction sites, confined spaces & more.