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The Edwards 876 AC & 877 DC Series are low-current, high decibel, vibrating horns for heavy-duty use and is UL listed to NEMA 4X enclosure requirements. The die-cast weatherproof box has a durable, corrosion resistant, electrostatic heat flowed powder epoxy gray finish. May be used for indoor applications. Mount on conduit or to any flat surface. A hole on the top has been drilled and tapped for 3/4" (19mm)-14 NPT conduit. Knockouts are located on the bottom and rear of the unit. Used where a distinctive, urgent signal is required for outdoor or weatherproof requirements such as: timing scheduling, paging, general alarm, personnel warning, and emergency evacuations. 872-PO Plastic Projector AdaptaHorn Accessory Plastic projector snaps onto any AdaptaHorn. Available as separate item.