15” Two-way Portable Speaker System,  400 watt Continuous Power Capacity.  15” Differential Drive Woofer and a 1.5 ” Annular Polymer Diaphragm Compression Driver, Duraflex™- Covered 16/18 mm Plywood Enclosure, 16 Gauge Steel Grille, Dual  35mm Pole Mount Socket, Non-Skid Rubber Feet.