Designed to produce a loud tone with typical decibel output of 102 dBA. Strong penetration due to resonation at low frequency. Ideal for use in boiler rooms, elevators, electrical panels, water pumping stations, air compressor rooms, cranes. Available with optional twin sound projectors Model DUF(R). Painted steel housing (Gray). Resonant grill design for high sound output. Low current draw to minimize power supply and wiring costs. Wide input voltage ratings for compatibility with unregulated power supplies. Screw terminal inputs for convenient in-out wiring.