AtlasIED AP-15TU loudspeakers are equipped with a compression driver providing up to 15 watts RMS power handling capability, superior intelligibility and dispersion to achieve maximum sound projection and penetration. Weather-resistant metal construction and re-entrant acoustic path assure protection against water, humidity, vermin and corrosion. The Omni-Purpose® mounting bracket allows directional sound dispersion via vertical and horizontal positioning. Provisions are also included for surface or strap mounting to pillars and I-beams. All models include a built-in 25/70.7V Vari-Tap® transformer featuring a screw-driver adjustable, 7-position watt/impedance selection switch. Wiring terminals are protected with a vandal-resistant adapter cover for control equipment utilizing cable or conduit. Model meets or exceeds the UL Listed standards for audible signal appliances and are capable of operating within an ambient temp. range of 66°C (150°F) to -35°C (-30°F). Model complies with UL Standard 1480—Loudspeakers for Fire Protective Signaling Systems and California State Fire Marshal (Title 19).