Omni-directional design provides for even coverage over a 2 mile radius in all directions. Horn is energy efficient with hermetically sealed diaphragm assemblyThermostatically controlled, heated, and weatherproof Horn construction: High strength aluminum casting, stainless steel diaphragm discs and fasteners.Includes combination electric solenoid operating valve with manual override.Product Specifications LENGTH INCHES36 WIDTH INCHES27-1/4 HEIGHT INCHES2-3/8 CONSTRUCTIONAluminum and Stainless Steel MANUFACTURERS PART NUMBERK4-1-EN-H-120 VOLTAGE460-230 WEIGHT LBS.255 BRANDKahlenberg DECIBELS140 dB(A) @ 1M DECIBEL140 dB(A) @ 1M FREQUENCY311 Hz PRESSURE REQUIRED--- PRODUCT GROUPMass Notification Horn AVERAGE AIR CONSUMPTIONn/a AIR CONNECTION---