All-in-one unit comes pre-assembled with back can and mounted transformer. It features quick-flip 70 or 25V selector switch and an easy-select transformer wattage dial. The choice of 8 or 9 individual wattage tap settings covers complete range of uses. This flame-retardant ABS unit also comes with insulated wires, has an attached metal seismic safety loop and built-in easy mount tabs for securing unit. The MA series is ideal, all-purpose value speaker covering wide range of commercial applications. The furnished 8 ohms tap selector also means speakers can be kept on-hand for unexpected residential installation needs.