The Seachoice Marine Signal Air Horn delivers a powerful 120-decibel sound from over three feet away, ensuring clear signaling in marine environments. Constructed from high-impact plastic, it is durable and reliable. This 8 oz. air horn meets USCG requirements and is 100% safe for the ozone while being completely non-flammable. Its refill canister is compatible with most handheld trumpets, making it a versatile and essential safety device for any boat.