Emergency Signaling Horn LoudspeakerA double re-entrant loudspeaker for superior intelligibilty and high efficiency.Designed for use with control equipment for reproduction of audible emergency and protective signals as well as voice messages.Contains a 5 mfd capacitor for use in systems with supervised circuitry (25/70.7 Volt).Specifications:* Power Taps: 1, 2, 3.8, 7.5, 15 Watt at 70.7 Volt*Frequency Response: 400-4,000 Hz (UL); 400-14,000 Hz (nominal)*Power Rating: 15 Watt rms*Dispersion: 70 Degree*Sensitivity: 102 dB at 15 Watt, 10 Foot (UL) 120 dB at 15 Watt (peak), 1m116 dB at 15 Watt, 1m (avg) 500-6,000 Hz106 dBat 1 Watt, 1m (avg) 500-6,000 Hz*Operating Temperature: -40 Degree F to +158 Degree F (-40 Degree C to +70 Degree C)*Weather- and vandalism-resistant*Dimensions (HxWxD): 8-3/4″ x 7-7/8″ x 9-5/16″ (~22.2cm x 20cm x 23.7cm)Meets or exceeds UL 1480 Standards for Fire Protective Signaling, as well as California State Fire Marshal (Title 19)Atlas SoundAP-15TUC