Economic, practical mini programmable switching DC power supply, optional RS232, RS485 and USB serial communication, support MODBUS RTU protocol, four LED intuitive display of voltage, current and output power, with 10mV/1mA high-precision resolution, the output voltage and current can be preset; over-voltage protection, over-current protection threshold from 0 to the maximum rated value of any setting, three groups of data storage recall conveniently. Convenient data storage and recall. Widely used in product aging maintenance, battery charging, experimental testing, production testing, electrolysis plating and other industries.