This set includes a genuine Stirling ULTRACOLD SU780XLE-75000 Power Board and a SU780XLE-70000 Inverter Board, essential for the proper function of a lab-grade freezer. These boards work together to power and control the unit's patented free-piston Stirling engine, which provides efficient and consistent cooling for ultra-low temperature environments. They are critical replacement parts for repairing a non-functioning Stirling ULTRACOLD upright freezer, commonly used in research and laboratory settings. This professional-grade component ensures the reliable performance and a stable temperature that is vital for protecting valuable samples and materials. These are a must-have for a biomedical technician performing a critical repair.