Super Blast 7218 Pump Air Horn Users simply pull handle & push for loud blasts Meets US Coast guard requirements for boats up to 65ft Recommended for coaches, boaters, officials, motorists, lifeguards, hikers, bikers, sports fans & more Emits no harmful gases to environment Economical & reusable no refills needed Easy to use Recommended for coaches boaters officials motorists lifeguards hikers bikers sports fans and more Thousands of uses U.S. Coast Guard certified for boats up 65 feet/20 meters.