-Excellent voice intelligibility and efficiencyFlange-mounted reentrant type loudspeakerWeatherproof design for indoor or outdoor useVandal-resistant for applications in hostile environmentsAll-metal contruction with black enamel finish15 watts max @ 70V or 25VWeather-sealed variable-tap impedance selector switchPower levels are: 15 7.5 3.6 1.8 or 0.9 watts for 70V systems and 15 7.0 1.8 0.9 0.5 0.25 or 0.125 watts for 25V systemsScrew terminals for fast and easy installationSelf-aligning field