Equipped with multiple temperature sensing ports to continuously monitor temperatures in refrigerator and freezer compartments, controlling the start and stop of cooling units and limiting temperature fluctuations inside chambers. Built with multiple circuit protection mechanisms that cut off power automatically under abnormal current or overheating to avoid overload operation of electronic components. Designed with standard wiring interfaces compatible with most household refrigerator wiring. Clearly marked terminals allow easy disassembly and replacement by matching wires accordingly. Supports multiple modes including refrigeration, freezing, quick cooling and timing. It steadily receives control panel signals to meet daily food storage needs. The orderly internal wiring and solid solder joints mitigate signal interference, ensure smooth transmission of operating commands and reduce operational abnormalities of the appliance.