From the <a href="http://www.fourjay.com/products/100-and-200-series-long-throw-re-entrant-horn-speakers#51"> manufacturer's website:</a>

216 Series - 16 Watt Horn

Product Description

Ideal for most general paging needs in moderate to high noise indoor and outdoor locations. Medium format 10" x 7-3/8" horn clearly reproduces full voice range.

Product Technical Specifications

• Designed for noise penetration and clear speech intelligibility.
• Conservatively rated at 16 watts continuous duty.
• Excellent sensitivity as a microphone in talk-back systems.
• Diffuser suppresses on-axis hot spot and improves dispersion.
• Powerful compression driver, steel parts plated to meet 96-hour salt spray test.
• Weather and corrosion resistant construction using stainless steel fasteners and engineering grade UV resistant thermoplastics.
• Mounting system designed for easy assembly and adjustment.
• Polycarbonate base features multiple mounting options.
• Manufactured in Fourjay’s factory under strict quality supervision.
• Accessory kits available for mounting versatility.
• Long cable for fast “hard wiring” and good weatherability.
• Selector switch for power taps on Model 216-TD. Color coded conductor cable for taps on 216/25-TD and 216/70-TD.
• Bug screen kit KB400 keeps out nests and reduces talk-back noise.
• Standard color is Tan.