QUALITY: S.O.L.A.S. approved. conforms to international maritime regulations. Extremely tough. Corrosion proof. Shatterproof. Industrial strength and performance from the ACME brand. LOUD: Over 122 dB. Audible at great distances. Ideal emergency fog horn for small craft. Useful on construction sites, for field sports warnings, on railways and airfields, as well as use in searches for lost individuals in forests and mountains. LARGE & LIGHT: The ACME 566 Signal Horn is the largest signal horn in the ACME range at approx 14.5 inches long and approx 2.25 inches at the open end, weighing just 0.054lb Genuine ACME Whistle made in the UK by specialists with over 150 years of experience. Part of THE ACME range of high quality whistles sold here on Amazon. Check out THE ACME store for more. Comes in three colourways: Black, Standard Orange and Day Glow Orange. S.O.L.A.S. approved. Brass all metal tuned reed mouthpiece and thermoplastic signal horn. With its industrial strength and performance, the ACME No 566 Signal Horn is extremely tough, corrosion proof, shatterproof and produces a penetrating blast; over 122 decibels of sound. Audible at great distances, conforms to international maritime regulations; ideal emergency fog horn for small craft. Useful on construction sites, for field sports warnings, on railways and airfields, as well as use in searches for lost individuals in forests and mountains. Extra large with a deep tone. Also available in Black and Standard Orange on another listing.