Edwards Signaling vibrating horns are low-current, high decibel, for heavy-duty use and are UL listed to NEMA 4X, NEMA 12 and NEMA 12K enclosure requirements. The die-cast box is suitable for outdoor use and has a durable, corrosion-resistant, electrostatic heat flowed powder epoxy gray finish. Edwards Signaling horns produce sounds designed to alert, warn, communicate and protect.