High intelligibility and efficiency; ideal for both one-way and talk back applications- Weatherproof, all-metal construction- 15 watts; 25/70 volt SPT15A- Tap settings for 70V: 15, 7.5, 3.8, 1.8, 0.9 watts; for 25V: 15, 7.5, 1.8, 0.94, 0.46 watts- Rotary tap impedance selector on SPT15A- Tilt and swivel base for easy positioning- Screw terminals make installation fast and easy- All-purpose mounting bracket- Self-aligning, field replaceable diaphragm- Mocha enamel finish- Limited Mountable to I-beam flange using BogenFTs BC1 Beam Clamp sold separately- Mountable to electrical box using BogenFTs HSES10 mounting strap sold separately- Terminal Cover TCSPT1 allows connection of conduit fittings to horn speakers sold separately