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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 HzS.P.L. (dB(A)): 131 dBS.P.L. (1/3 Octave @ 1 Meter): 122.9 dBAir Consumption: 9 C.F.M. @ 100 p.s.i., 4.2 l/s @ 7 barAir Pressure Required: 50 to 200 p.s.i., 3.5 to 14 bar Other parts needed for a complete system: Compressed Air System, Switch & Solenoid Valve Kit.