High-power four-knob switching power supply, four-digit LED intuitively display voltage, current, output power and output equivalent impedance, with 10mV/10mA resolution; with short circuit, overvoltage, overcurrent, overpower, reverse polarity protection functions. High output efficiency, one-button control output on-off switch, convenient and safe. Widely used in product aging, battery charging, experimental testing, production testing, electrolytic plating and other industries; widely used in product aging maintenance, battery charging, experimental testing, production testing, electrolytic plating and other industries.