Models include a built-in 15-watt compression driver with 45-ohm impedance. Model SC-15-45 is a 45-ohm unit for intercom uses and Model SC-15 is an 8 ohm version for multi-purpose installations. All SC Series loudspeakers are equipped with a high impact molded plastic bell, metal mounting bracket and will an accommodate optional 70.7/25-volt transformer. They also feature a swivel base with nut assembly for easy-to-adjust horizontal and vertical positioning. Termination is via a 12" connecting cable. Finish is light beige epoxy.