The QJE PS30SWIV switching power supply provides 13.8 V DC at 20 Amps continuous, 30 amps surge. The output voltage may be selected fixed at 13.8 V DC or adjustable from 9 to 15 V DC. Red and black (30 A) terminals on are the rear panel. There are also low amperage tip jacks on the front panel. The LCD digital panel meter simultaneously displays voltage and current. There is a noise offset control that can be adjusted to eliminate pulse noise from the power supply. Ripple is less than 100 mVpp at load. Input is 110 or 220 V AC, switch selectable from the rear panel.