The Bogen FMH15T is a flange-mounted high intelligibility reentrant type loudspeaker. Its sturdy weatherproof vandal-resistant all-metal construction is ideal for indoor and outdoor use in industrial plants warehouses schools construction sites transportation terminals and recreational areas. The Model FMH15T has a built-in variable impedance selector switch for matching the speaker power requirements to a 70V or 25V constant-voltage line. Screw terminals make installation fast and easy. Accessory flush- or surface-mount enclosures heavyduty cast aluminum grille and adapter ring are available to complete the installation of this unique speaker. Field maintenance is accomplished using a self-aligning field replaceable diaphragm. Excellent voice intelligibility and efficiency Flange-mounted reentrant type loudspeaker Weatherproof design for indoor or outdoor use Vandal-resistant for applications in hostile environments All-metal construction with black enamel finish 15 watts max. @ 70V or 25V Weather-sealed variable-tap impedance selector switch Power handling is 0.9 1.8 3.6 7.5 or 15 watts for 70V systems and 0.125 0.25 0.5 0.9 1.8 7.0 or 15 watts for 25V systems Screw terminals for fast and easy installation Self-aligning field replaceable diaphragm for easy field maintenance Select flush or surface mount enclosure for installation (each sold separately) Heavy-duty cast aluminum grille and adapter ring for installation (each sold separately).