Economical and practical mini programmable switching DC power supply, optional RS232, RS485 and USB serial port communication, support MODBUS RTU protocol, four-digit LED intuitively display voltage, current and output power, with 10mV/1mA high-precision resolution, output voltage and current can be preset; the overvoltage protection and overcurrent protection thresholds can be set arbitrarily from 0 to the maximum rated value, and the three groups of data storage and recall are convenient and quick. Widely used in product aging maintenance, battery charging, experimental testing, production testing, electrolytic plating and other industries.