Omni-directional design provides for even coverage over a 2.5 mile radius in all directions. Horn is energy efficient with hermetically sealed diaphragm assemblyCompletely enclosed and heated for outdoor use in extreme weather conditionsHorn construction: High strength aluminum casting, stainless steel diaphragm discs and fasteners.Includes combination electric solenoid operating valve with manual override.Product Specifications LENGTH INCHES42-3/4 WIDTH INCHES42-3/4 HEIGHT INCHES3-1/4 CONSTRUCTIONCast Aluminum, Steel, Stainless Steel MANUFACTURERS PART NUMBERK4-12-EN VOLTAGE115 WEIGHT LBS.240 BRANDKahlenberg DECIBEL144 dB(A) @ 1M FREQUENCY311/370 Hz PRESSURE REQUIRED50-150 p.s.i. PRODUCT GROUPMass Notification Horn AVERAGE AIR CONSUMPTION184 SCFM AIR CONNECTION1-1/4FNPT