The Mars 24013 Universal 40VA Fan Control Center Relay is a versatile product designed to control fan speed in a heating, cooling, or air system. It is compatible with various voltage levels, including 110, 115, 120, and 24 volts, making it suitable for a wide range of applications. With its universal design, this fan control center relay can easily be incorporated into various home improvement projects related to heating, cooling, and air systems, ensuring efficient and reliable performance for your home or garden. Box is worn and stained from storage. Please see pictures for additional details.