The Edwards 870P AC and 871P DC series are low current, high decibel panel mount vibrating horns for heavy duty use. Supplied complete with gasket and UL listed to NEMA 4X enclosure requirements. Designed for semi-flush panel mounting, using supplied mounting template or installation on a 4 in square box. For NEMA 4X installation, mount to a NEMA 4X enclosure having a flat, smooth surface using supplied 1/8 in gasket in accordance with the installation instructions provided with the unit.