Atlas Sound 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-PurposeÂ® 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-TapÂ® 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 AP-15TU is not equipped with a capacitor. Model meets or exceeds the UL Listed standards for audible signal appliances and are capable of operating within an ambient temp. range of 66Ã‚Â°C (150Ã‚Â°F) to -35Ã‚Â°C (-30Ã‚Â°F). Model complies with UL Standard 1480-Speakers for Fire Protective Signaling Systems and California State Fire Marshal (Title 19).