- 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 lifetime warranty- Mount