The Wheelock S8-70/25 Ceiling-mount Dual-voltage Speaker provides high audible output with clear audibility at either of its field-selectable voltages (25 VRMS or 70 VRMS) and at all of its field-selectable powers (1/8 W, 1/4 W, 1/2 W, 1 W, 2 W, 4 W, or 8 W). The speakers have a 12-inch round metal grill and a molded, flame-retardant core.