Four-channel power supply, with dual-channel 30V/3A and single-channel 5V/3A output, double knob adjustment, easy to adjust the output voltage and current value. characteristic *4 sets of independent DC power output *4 3-digit displays, which can display two sets of voltage and current at the same time *Automatic series and automatic parallel synchronous operation *Constant voltage and constant power operation *Low continuous wave and noise *Overload and reverse polarity Protection * selectable continuous/kinetic load * output Enable/Disable control * temperature control cooling fan speed