Falcon Sonic Blast Signal Horn 5ozThe Falcon Sonic Blast Signal Horn uses HMO1234ze, a specially formulated, non-flammable propellant that has a very low Global Warming Potential (GWP). The Sonic Blast Horn is a great option for uses where flammability is a concern, including manufacturing plants, confined spaces, construction sites, boating, and emergency alarm stations. Durable high-impact plastic trumpet Provides up to 56 blasts per can Meets US Coast Guard requirements for boats up to 65 (20 meters) Provides 120dB at 10 feet.