The UL-8 is a complete UL Listed, fire-protective signaling device with an 8C10PAFR - 8” O.D. loudspeaker, 10 oz. magnet, fire retardant components, a 5W-25V jumper select transformer and a BR8W - round, screw-mount baffle in a white powder coat finish. An ERD-8 - 275 CID, round, steel back box with a white powder coat finish is included.