Omni-directional design provides for even coverage over a 3.5 mile radius in all directions.Horn is energy efficient with hermetically sealed diaphragm assembly which operates on a wide range of pressure without tuning or adjustment.Horn construction: High strength aluminum casting, stainless steel diaphragm discs and fasteners.Includes combination electric solenoid operating valve with manual override.Product Specifications LENGTH INCHES70-1/2 WIDTH INCHES70-1/2 HEIGHT INCHES63 CONSTRUCTIONCast Aluminum, Steel, Stainless Steel MANUFACTURERS PART NUMBERKM3-165 VOLTAGE115 WEIGHT LBS.210 BRANDKahlenberg DECIBEL147 dB(A) @ 1M FREQUENCY165 Hz PRESSURE REQUIRED100-150 p.s.i. PRODUCT GROUPMass Notification Horn AVERAGE AIR CONSUMPTION324 SCFM AIR CONNECTION1-1/4FNPT