CELL20BDT is rugged bidirectional sound projectors having two 5.25-inch full-range twin-cone speakers, one at either end of the rugged extruded aluminum housing. Model offer long-term reliability and even coverage for distributed audio, including transformer and stainless steel hardware. It uses twin-cones for good sound dispersion. Visually identical, they are white and equipped with stainless steel hardware. It has matching aluminum grilles and slide-on mounting brackets. Units may be refinished with epoxy paint.