Flanged Horn Speaker with 15-Watt 25V/70V/100V Transformer Double Re-Entrant Design Provides Superior Audibility of Voice and Tone Signaling High-Efficiency, 15 Watt Compression Driver with Proven Record of Outstanding Service Reliability Transformer(T) Equipped Version for 25, 70.7, or 100V Line Vandal and Environment-Resistant Metal Construction for Outdoor or Indoor Use