- 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- mountable to i-beam flange using bogens bc1 beam clamp (sold separately)- mountable to electrical box using bogens hses10 mounting strap (sold separately)- terminal cover (tcspt1) allows connection of conduit fittings to horn speakers (sold separately)