Speco SP5MAT - 5.25-Inch 25 / 70 Volt Ceiling Loudspeaker with Back BoxSpeco Technologies Multi Application Series was designed to make the contractors work as easy and time efficient as possible. Our all in one unit comes pre assembled with back can and mounted transformer. It features a quick flip 70 or 25 Volt selector switch and an easy select transformer wattage dial. The choice of 8 or 9 individual wattage tap settings covers a complete range of uses. This flame retardant ABS unit also comes with insulated wires,