High Efficiency, One-Way, 15 W, Self-Amplified, Grey Horn, weather-resistant for indoor/outdoor applications; meets needs of industrial applications like warehouses/manufacturing environments. Utilizes Standard Telcom/Datacom Wiring CAT 3/5/6 – Weather-Resistant For Indoor/Outdoor Use – Omni-Lock Mounting System – Matches Standard Hole Patterns In 2 Gang Electrical Box – Built-in Volume Control For Individual Adjustment – Built-in Amplifier Increases Reliability, Flexibility – Includes I-Beam Clamp