Speaker High intensity,waterproof, dampproof and corrosion-proof shape Quality alnico,high efficiency conversion ... Factor:<5%Sound Pressure:120-130dBNet WT: 2.95kgHigh intensity,waterproof, dampproof and corrosion-proof shapeQuality alnico,high efficiency conversion, ... making,high dependability.Can provide all kinds of speaker windings and fittings.Speaker series are fitted for same power sirens.Horn ...