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IMO Certified for boats up to 65 feet (20 Meters) in length. Constructed entirely of bronze and brass it is built for a lifetime of service. Output exceeds other horns of similar size. Frequency: 322 & 254 HzS.P.L. Output: 133 dB (A) @ 1 MeterAir Consumption: 17.6 C.F.M., 8.3 l/sOperating Pressure: 50 to 200 p.s.i. (3.5 to 14 bar)Certification: ABS, NMMA Certified A-23 Other parts needed for a complete system: Compressed Air System, Switch & Solenoid Valve Kit.