... ,more sturdy and durable4. Advanced international control technology, over current /over voltage /phase lack/water lack self- protection functions ... much longer; 5. It has the constant voltage, constant current mode , 0-180 seconds adjustable soft start function; The ... voltage12V,15V,18V,24V Arbitrary choiceVoltage stability≤1%Current stability≤1%Ripple factor 1%-3%Cooling ModeForced air cooled or ...