All DC voltages are independent of each other and can be used simultaneously - Voltages have course and fine continuous adjustment Each out put is regulated, and has overload and short circuit protection Power supply has an input voltage switch which allows the unit to run on 110/120 AC, or 220/240 DC Power supply is constructed of strong ABS case, uses 4mm banana plug sockets, (2) LED output screens, LED warning indicators (5), analog heavy duty components Power supply is CSA, CE, and RoHS certified 4 Output DC power supply, regulated, dual adjustment, independent DC voltages, [+5V, 3Amp], [+12V, 1Amp], [-12V, 1Amp], [0-20V, 2Amp]. All outputs are independent of one another and can be used simultaneously. A great universal power supply for driving lamps, lights, motors, science demonstrations, physics experiments. Built in an analog sturdy fashion for years of safe use, backed by the highest electrical standards.