The MC4001 Bard Solid State Dual Unit Lead/Lag Controller is a new unit designed for HVAC and refrigeration systems. Made of metal and with dimensions of 3 inches in thickness, 13.5 inches in length, and 9.25 inches in width, this unit controller operates on 24 volts and is manufactured in the United States. The dual unit design allows for efficient lead and lag control, making it a reliable choice for industrial heating and cooling applications.